It'd be really cool if there was a good VR app that allowed for viewing and exploring scenes in the way other animals see, with color/pupil/angle adjustments
We can only ever see a subset of our own visual capability. That is to say the very will never allow us too see the world as good as an animal who can see better than us. For example, wearing glasses may allow us to see clearer but it comes at the cost of a decreased field of vision.
You can't, because your vision, like all animals, is a construct of the brain. The eyes turn the light into electrical signals that goes down the optic nerve to the brain where it constructs it to a picture that we will have no idea what it looks like. The brain could possible be doing lots of tricks with that signal, based on what the creature's evolutionary needs are. Our brain flips the image and also hides the dead spots in our vision for starters.
There were a couple of American science shows always started and stayed around the most basic information and rarely went beyond a certain level, like 4th grade level science max. That's disappointing. I wanted a slightly more advanced science show growing up and Nickelodeon stopped playing Mr. Wizard's World by the time Beakman and Bill Nye were gaining momentum.
Fun fact many animals like goats aside from rotating their eyeballs up,down,left and right can also twist them clockwise and counterclockwise to align the horizontal plane of the slit of their pupils to the ground when they tilt their heads down to eat stuff like grass, we can also twist our eyeballs but to a way lesser extent.
Ah I was wondering if that was the case. I figured with the angle of a horse's head when feeding, the eye would align up and down or slightly diagonal, creating a problem, but nature has it figured out.
@@Boxofcare666 That's indeed right. We even have a muscle that rotates the eyes a little bit, but the usefulness of it is questionable. That's how evolution works.
Im so blessed to have had these guys during my childhood. TV was so much more wholesome for kids back then. Even at 53,I have a curious mind and im sure shows like this were a major factor. 🧡
Thanks. Curiosity Show was a national science program for children featuring Dr Rob Morrison and Dr Deane Hutton. It was made in Adelaide, South Australia and screened nationally in Australia as well as in Europe, Asia and Australasia (14 countries) from 1972-1990. Deane and Rob intentionally used everyday items around the house (like old cans) so that children could repeat the demonstrations with materials they had to hand. In 1984 Curiosity Show won the Prix Jeunesse International, the world's top award for children's TV programs. Rob and Deane are steadily uploading segments at ua-cam.com/users/curiosityshow Why not subscribe?
i was born in 1973, i credit this show as the reason i always had such an interest in science and just simply trying to expand what i know. it was absolutely briliant and i wish it was still on TV today to help kids expand their thinking rather than the mindless crud that kids watch today
Only discovered this channel recently. Absolutely loved watching it growing up in Sydney. Now as a 47 year old child I can watch my fav show all over again. deeply awesome!!! Binge watch in 3....2.....1!! Many Thanks Dr Rob and Dr Deane
Thanks. Great explanation. Reminds me a bit of the horizonal slit in Inuit's snow goggles; giving them surprizing good vision while protecting the eyes for the harsh cold and, more importantly, snow blindness.
I always tried to figure out but never got a satisfactory explanation.I thought it might be due to polarisation of light vertical or horizontal for the predator or prey to see the image limpid obscuring glare.This was the exact explanation I was looking for.Thanks for making science alive again.
I grew up watching you guys from the early 80s onwards . I'm stoked to find this channel after so long 🙌🏼 thank you for the uploads, and the memories!!
Love this show so much! Never got the privilege to watch it in my country but thank you so much for making it available worldwide. Cannot stress it enough!
Thanks. Curiosity Show was a national science program for children featuring Dr Rob Morrison and Dr Deane Hutton. It was made in Adelaide, South Australia+ and screened nationally in Australia as well as in Europe, Asia and Australasia (14 countries) from 1972-1990. Deane and Rob intentionally used everyday items around the house (like old cans) so that children could repeat the demonstrations with materials they had to hand. In 1984 Curiosity Show won the Prix Jeunesse International,the world's top award for children's TV programs. Rob and Deane are steadily uploading segments at ua-cam.com/users/curiosityshow Why not subscribe?
@@CuriosityShow YES GREAT SHOW. WATCHED IT AVIDLY LATE 70'S EARLY 80'S AMID the myriad of great aussie children shows of that era. though i distinctively remember Deane the most. How the wrld has changed, far more information yet far lesser learning.. Thanks for the re-flash of my memory banks. truly a long term investment. If only for the curiosity it created and the surrounding memories of that long ago time abound
Found this channel ( or rather it found me) 2 days ago. Every video I watch I learn something I didnt know that I didnt know. Wish i'd found you 8 years ago.
Maybe there is something I missed. When the slit is vertical, the arrow looks blurry in the vertical direction, the resolution is poorer in this direction, it seems to be in contradiction with the explanation about cats needing to have a better vision in the vertical direction. Also, the actual eye is very different from a pin hole, because it has a lense and the retina is at the focal point. So the size of the pupil doesn't have any effect on the focus but only on the amount of light that is collected, does it?
It's a bit of an odd explanation. The pinhole is representing the lens and not the pupil. I don't think there would be any blurring caused by the slit pupil because otherwise they'd just have circular ones like ours. Also, it makes it seem like sheep eyes are just cat eyes but horizontal. Sheep eyes are not the same as cat eyes in the way that they contract because they don't have the same problem of wrinkling during the day time. They're more like ours in that sense.
Pretty sure it's because poor resolution vertically still leaves you with a precise direction in which to pounce, while a similarly poor horizontal resolution would be introducing margin for error. Margins of error in depth are much easier dealt with via the cat's leap or crocodile's charge by simply increasing or reducing your momentum (as much as possible in the specific circumstance, of course) than margins of error in direction where existing momentum has to be somewhat overcome to realign to a target.
TL;DR If slit eyes were amazing all animals would have them, they are a trade off used by small animals to increase their peripheral vision at the cost of visual acuity. The slit causing vision problems isn't wrong, cats, owls, and coyotes have "shiny" eyes, because they have light reflectors in the back of their eyes to help them see at night. Theirs's a reason large animals and those that need to see further, wolves, lions, and owls all have round pupils. The explanation might be a bit misleading but the goats smear shows the value quite well, if your a cat or gecko you need to be able to judge and see vertical distance, the width can be off because you just need to know if it's coming at you or running away, a smeared image just shows your not properly aligned. Cuttlefish have w shaped pupils that expand and contract to let in different kinds of light, they have terrible long distance but can make very detailed images of their surroundings to create better camouflage. Spiders have several sets of eyes each with different focuses, color, light, distance etc. Many non-mammals have a parietal eye, this is a proto-eye that detects light/shadow to allow the animal to see predators coming from above.
@@Bzorlan Slit pupils do cause blurring, in the same way squinting your eyes causes blurring. It's called the diffraction limit, the narrower the opening the blurrier the image. However, this would only be a problem when the pupils are very narrow, which for a cat is during the day when they don't need perfect vision anyways. This is a large part of why space telescopes are so large, the bigger the opening the less blurry, and therefore the more you can zoom in and still get a good image. It's also the reason why it's actually harder to see if it's too bright.
There's more to the story of pupils than hinted at here. A slit pupil will introduce diffraction that is of a larger magnitude perpendicular to the slit orientation. If the slit narrows sufficiently, this will have an impact upon resolving power. Take the cat's vertical pupil. When narrowed down, an image of a point source on the retina will have diffraction of light somewhat 'smearing' the point horizontally; in the vertical direction no such smearing will be discerned. When the slit has narrowed to a bit less than 1mm, this diffractive impairment to image fine-scale contrast/resolving power will manifest. However. Nature does not always make every eye to the correct dimensions in all respects. Eyeglass wearers can attest to that! Before eyeglasses were invented, folk with near- or far-sightedness, or with bad astigmatism, often found that squinting would sharpen the image helpfully. Here's where the narrowed iris--circular or slit--comes to the aid of a creature suffering vision defects. A smaller entrance pupil causes to utilize a smaller area of the compromised lens/cornea, which smaller area introduces a lesser magnitude of aberrations. For even a tiny iris (in bright light) any diffraction which might slightly impair resolution for a fully functional eye is, to the myopic/presbyopic/astigmatic eye, a rather lesser defect to suffer. And if the iris is not quite small enough for diffraction to be an issue at all, the sharper image is a definite boon. Back to the cat, and its vertical slit iris. Leaving diffraction out of it (which in any event is a minor aberration), and assuming non perfect vision, its daytime vision will have an image where resolution is better on the horizontal axis, and depth of focus is also better in the horizontal. That is, resolving power will be better on the axis perpendicular to the slit axis. If a grid of closely spaced lines is examined, the vertical lines will be more sharply resolved than will the horizontal lines. That's what the pinhole/slithole camera is demonstrating here. The lack of a lens simulates a defective eye that cannot form a sharp, aberration-free image. For those experimentally inclined, to appreciate diffraction you can view a daytime scene, or distant/angularly tiny lights at night through a variety of pinholes and thin slits poked/cut in tinfoil and held very close in front of your eye. For a hole diameter or slit width of about 1mm, diffraction becomes apparent. The smaller the aperture, the greater in magnitude the diffraction--and the dimmer the image.
i think the reason they didnt talk about that is that literally no one understands half of what you're talking about. yeah theres a lot more information to be had on topics, this channel isnt diving into the deep advanced physics or anything, its just like a 2 minutes little blip of hey, did you know this? you're gunna need some visual aids with those paragraphs buddy.
@@Kugrox My little epistle wasn't intended to be a critique. I know that back in the day this show's primary audience was school kids. But probably more adults than kids watch these UA-cam snippets. ;) Anywhoo, I was just supplying extra info for those who might have more than a passing interest. I did describe a simple experiment one could easily do, which is in the spirit of these programs. Cheers!
You could also relate it to diffraction patterns expressed by slit experiments done to show the wavelike properties of light, and how the pattern changes shape depending on the shape of the passage/iris. Such as in the slit experiment we get a repeating vertical pattern that translates horizontally because the slits were vertical and phased horizontally, but in cameras that use a circular opening we get repeating concentric circles. That is why changing the shape of the iris changes the shape of the out-of-focus elements in a photograph (like making a diy aperture in front or behind the lens changes how point-light sources appear away from the field of focus). How that plays in a similar fashion to vertical slits would be interesting to see illustrated, because the more finely-detailed effects aren’t really well-observed through a pinhole camera outside of viewing point-sources and in-focus elements, such as the one presented here in the video.
@@Kugrox i mean i don't think so tbh i graduated a few years back so i might not be the best example but from the majority of what they Further explained is pretty understandable.
One thing this video left out is binocular vision. The reason the vertical slit is so advantageous to ambush predators is because they have forward-facing eyes, and the vertical slit greatly enhances their depth perception because they can precisely the measure distance to their target based on that overlapping area where both eyes see the same target. In contrast, animals with horizontal pupils tend to have side-facing eyes, with very little overlap, but a VERY wide field of vision. This allows them to detect a predator from nearly any direction. Depth perception doesn't matter as much to them because they just need to run away from whatever direction they detect the predator to be coming from.
I've never seen an lion(ess) hunt at night. I've seen footage of lions investigate a tent at night if they smelled food but actual stalking was done during the day.
Slit pupils on hunting animals only occurs in animals which are small (cats, foxes) or very low to the ground, such as alligators. Big cats have round pupils. Seems to have something to do with how close you are to the ground.
@@CuriosityShow wait... Is this really Rob!? That's so cool! You've made an excellent program. I'm watching for the first time as an adult and I can't get enough. It's a lot more interesting than most of the kids shows when I was young, here in Canada.
Yes, it is me. Deane and I do what we can to reply to posts - depending a bit on the volume (and sometimes the tenor of them . Keep watching and, if you haven't done so, why not subscribe to ua-cam.com/users/curiosityshow We post new stuff on Mon, Wed and Fri - Rob
Exactly why we watched this show in Primary school. I was in Primary school when this show was in TV - late 70s or so - and every week our class would file into the admin building, may have been the teachers lounge, I'm not sure, to watch this show. Awesome part of the school week
Thank you for explaining this without a single reference to the religion of evolution. I give you two thumbs up, a share AND a subscribe just for that. "Good show, Ol' boy!"
Honestly, saying like and subscribe in replies instead of the video is not only a refreshing but also a genius idea at the same time. Not saying you can really sugar coat selling out yourself but I appreciate it.
THESE people are so wonderful and hard to come by. not only are they smart, they know HOW ato explain their smart. It’s like the PERFECT teacher 😍 it’s so frustrating (no offense) to have like those PhD professors in school who theoretically have so much knowledge but can’t explain well enough to teach. at least in my experience and what I’ve heard from others
I grew up with this show as a child absolutely awesome and so informational … It was another world back then … how much things can change in one generation is incredible!
I grew up watching this show. It was responsible for developing the thirst for knowledge that is still with me today. I still remember getting the books as birthday presents (Earth, Wind, Air and Fire). They had great experiments you could easily do at home.
This had been puzzling me for a long time. I knew it had to have something to do with prey vs. predator, but I couldn't figure it out. Then I saw this video recommended and I couldn't resist. Thanks for the concise and interesting explanation.
this was the very first clip I've seen from this show and channel. I've watched at least 20 other videos whenever youtube popped it up. I like the fantasy, the ideas, uniqueness, that it is for every age, it's new information and puzzles
wow this was insightful! i never even thought about why this is so amazing. So what about a Bat, can't see well & must have slit pupil, but they fly at night ... Great Video & Info TY!
I read somewhere that the slit helps with navigating their environment. Smaller cats and reptiles hunt in vertical grass and reeds, hence the vertical slit. I have no idea why cuttlefish eyes are W shaped.
Used to watch this show when I was around 10, 40 years ago roughly. Was a great show with them making science and math fun, the 2 of them were very smart blokes.
This is Australian TV in the 70s. We were brought up on this stuff. It is a big part of why my generation is quite knowledgeable. We were actually taught real stuff back then.
This is so much better than the videos made nowadays where there's too mch jumping around and distractions, it's such a clearer way to give information
Excellent content. Great presentation and explanation of concepts in very simple way. I have started binge watching the episodes. Kudos for your efforts to bring it to this platform.
It'd be really cool if there was a good VR app that allowed for viewing and exploring scenes in the way other animals see, with color/pupil/angle adjustments
This is actually an incredible idea
Would be difficult for animals that have a wider visible color spectrum than us.
We can only ever see a subset of our own visual capability. That is to say the very will never allow us too see the world as good as an animal who can see better than us. For example, wearing glasses may allow us to see clearer but it comes at the cost of a decreased field of vision.
You can't, because your vision, like all animals, is a construct of the brain. The eyes turn the light into electrical signals that goes down the optic nerve to the brain where it constructs it to a picture that we will have no idea what it looks like. The brain could possible be doing lots of tricks with that signal, based on what the creature's evolutionary needs are.
Our brain flips the image and also hides the dead spots in our vision for starters.
It would be extremely difficult to capture different fields of view but it would be amazing imagine being an ant or a fly or a lizard
i only discovered this show recently, but the quality of the content and presenters is incredible. thanks a lot.
Many thanks. If you haven't already, why not subscribe at ua-cam.com/users/curiosity for hundreds more segments - Rob
many thanks - please spread the word - Rob
And I discovered it in 2022 17th of January
@@CuriosityShow your hard work is going to pay you off now.... it's going viral now... 👍👍👍
Yeah this is quality content, thanks Rob
This show is great. Presenters are very concise and likeable too. I'm 32 and I'm watching loads of these "kids" videos lol
Glad you like them. Very kind of you - Rob
I'm 45 and love to see this education show very much! 😁
@@bapakerwe2010 yay :)
There were a couple of American science shows always started and stayed around the most basic information and rarely went beyond a certain level, like 4th grade level science max. That's disappointing. I wanted a slightly more advanced science show growing up and Nickelodeon stopped playing Mr. Wizard's World by the time Beakman and Bill Nye were gaining momentum.
Jeeze, I'm glad I'm not the only one approaching 30 that still enjoys this stuff lol
I'm 40 years old and bingewatching this series on youtube because every episode answers questions I've had my whole life.
Fun fact many animals like goats aside from rotating their eyeballs up,down,left and right can also twist them clockwise and counterclockwise to align the horizontal plane of the slit of their pupils to the ground when they tilt their heads down to eat stuff like grass, we can also twist our eyeballs but to a way lesser extent.
also less useful because the pupil is round so twist the eyeball gives the same results
Ah I was wondering if that was the case. I figured with the angle of a horse's head when feeding, the eye would align up and down or slightly diagonal, creating a problem, but nature has it figured out.
Whoa
Humans too
@@Boxofcare666 That's indeed right. We even have a muscle that rotates the eyes a little bit, but the usefulness of it is questionable. That's how evolution works.
It's amazing the creator is still replying to comments even now. Incredible show!
Thanks - Rob
@@CuriosityShow
No way!
You guys rock!!
@@CuriosityShow the goat 🙏
@@CuriosityShow my man! You're awesome!
That's real love for sharing knowledge. Very touching.
Im so blessed to have had these guys during my childhood.
TV was so much more wholesome for kids back then.
Even at 53,I have a curious mind and im sure shows like this were a major factor. 🧡
That's brilliant,
I've seen animal's pupils before, but never gave a thought about it
Thanks. Curiosity Show was a
national science program for children featuring Dr Rob Morrison and Dr Deane
Hutton. It was made in Adelaide, South Australia and screened nationally in
Australia as well as in Europe, Asia and Australasia (14 countries) from
1972-1990. Deane and Rob intentionally used everyday items around the house
(like old cans) so that children could repeat the demonstrations with materials
they had to hand. In 1984 Curiosity Show won the Prix Jeunesse International,
the world's top award for children's TV programs. Rob and Deane are steadily
uploading segments at ua-cam.com/users/curiosityshow Why not subscribe?
Yes, it is a pretty crude model, but it makes some sense of the extraordinary pupils you see on some animals - geckos included - Rob
i was born in 1973, i credit this show as the reason i always had such an interest in science and just simply trying to expand what i know. it was absolutely briliant and i wish it was still on TV today to help kids expand their thinking rather than the mindless crud that kids watch today
+CuriosityShow
is this actually you guys uploading these?
Predatory animals are in portrait mode, prey animals are in landscape mode.
I'm going to commit this quick phrase to memory; does anyone have a reason why this is not a fair and realistic comparison?
Sounds good to me
@@dahncarter4233 It's good.
This was my absolute favourite show growing up as a kid and I am so glad that the episodes are being uploaded here.
Only discovered this channel recently. Absolutely loved watching it growing up in Sydney. Now as a 47 year old child I can watch my fav show all over again. deeply awesome!!!
Binge watch in 3....2.....1!!
Many Thanks Dr Rob and Dr Deane
Our very great pleasure - Rob
Researcher who found the picture of the goat: you had one job.
I grew up watching this show...I loved it!! I’m so happy it’s on YT.
Oh wow. Takes me back to my childhood. So glad they've given access to this amazing and informative show of old. Love it.
Thanks. Great explanation.
Reminds me a bit of the horizonal slit in Inuit's snow goggles; giving them surprizing good vision while protecting the eyes for the harsh cold and, more importantly, snow blindness.
I always tried to figure out but never got a satisfactory explanation.I thought it might be due to polarisation of light vertical or horizontal for the predator or prey to see the image limpid obscuring glare.This was the exact explanation I was looking for.Thanks for making science alive again.
Excellent, thanks. Lots more at ua-cam.com/users/curiosityshow - subscribe if you haven't already - Rob
I grew up watching you guys from the early 80s onwards . I'm stoked to find this channel after so long 🙌🏼 thank you for the uploads, and the memories!!
This is such a brilliant show. We need this to come back. Kids by nature, WANT to learn.
Interesting content, no sponsor ads and no annoying music necessary. A perfect video.
Love this show so much! Never got the privilege to watch it in my country but thank you so much for making it available worldwide. Cannot stress it enough!
Thanks. Curiosity Show was a national science program for children featuring Dr Rob Morrison and Dr Deane Hutton. It was made in Adelaide, South Australia+ and screened nationally in Australia as well as in Europe, Asia and Australasia (14 countries) from 1972-1990. Deane and Rob intentionally used everyday items around the house (like old cans) so that children could repeat the demonstrations with materials they had to hand. In 1984 Curiosity Show won the Prix Jeunesse International,the world's top award for children's TV programs. Rob and Deane are steadily uploading segments at ua-cam.com/users/curiosityshow Why not subscribe?
@@CuriosityShow Wish I could warn you about your future... I’m not a time traveler though.
I second that
@@CuriosityShow YES GREAT SHOW. WATCHED IT AVIDLY LATE 70'S EARLY 80'S AMID the myriad of great aussie children shows of that era. though i distinctively remember Deane the most. How the wrld has changed, far more information yet far lesser learning.. Thanks for the re-flash of my memory banks. truly a long term investment. If only for the curiosity it created and the surrounding memories of that long ago time abound
Was their a woman with black curly hair connected to this show as well Rob?
Thanks Rob and Deane, awesome shows !
Many thanks, kind of you, lots more at ua-cam.com/users/curiosityshow - subscribe if you haven't and please spread the word - Rob
As a 41 year old woman in 2022, I'm shook right now!! This is so interesting!
Nice heinz ketchup bottle
Was literally only speaking about this show the other day! I used to love it so much as a kid so im absolutely stoked to find this channel 😁
Hope you enjoy it - Rob
@@CuriosityShow aaaaagghhhh, total fan girl moment!! Thankyou for the reply, you've made my day 😍🙏🏻
Ahh the nostalgia hits hard. Incredible stuffs
I wish this was part of my childhood.
This is fantastic.
Found this channel ( or rather it found me) 2 days ago. Every video I watch I learn something I didnt know that I didnt know. Wish i'd found you 8 years ago.
Maybe there is something I missed. When the slit is vertical, the arrow looks blurry in the vertical direction, the resolution is poorer in this direction, it seems to be in contradiction with the explanation about cats needing to have a better vision in the vertical direction.
Also, the actual eye is very different from a pin hole, because it has a lense and the retina is at the focal point. So the size of the pupil doesn't have any effect on the focus but only on the amount of light that is collected, does it?
It's a bit of an odd explanation. The pinhole is representing the lens and not the pupil. I don't think there would be any blurring caused by the slit pupil because otherwise they'd just have circular ones like ours.
Also, it makes it seem like sheep eyes are just cat eyes but horizontal. Sheep eyes are not the same as cat eyes in the way that they contract because they don't have the same problem of wrinkling during the day time. They're more like ours in that sense.
Pretty sure it's because poor resolution vertically still leaves you with a precise direction in which to pounce, while a similarly poor horizontal resolution would be introducing margin for error.
Margins of error in depth are much easier dealt with via the cat's leap or crocodile's charge by simply increasing or reducing your momentum (as much as possible in the specific circumstance, of course) than margins of error in direction where existing momentum has to be somewhat overcome to realign to a target.
TL;DR If slit eyes were amazing all animals would have them, they are a trade off used by small animals to increase their peripheral vision at the cost of visual acuity.
The slit causing vision problems isn't wrong, cats, owls, and coyotes have "shiny" eyes, because they have light reflectors in the back of their eyes to help them see at night. Theirs's a reason large animals and those that need to see further, wolves, lions, and owls all have round pupils. The explanation might be a bit misleading but the goats smear shows the value quite well, if your a cat or gecko you need to be able to judge and see vertical distance, the width can be off because you just need to know if it's coming at you or running away, a smeared image just shows your not properly aligned.
Cuttlefish have w shaped pupils that expand and contract to let in different kinds of light, they have terrible long distance but can make very detailed images of their surroundings to create better camouflage. Spiders have several sets of eyes each with different focuses, color, light, distance etc. Many non-mammals have a parietal eye, this is a proto-eye that detects light/shadow to allow the animal to see predators coming from above.
@@Bzorlan Slit pupils do cause blurring, in the same way squinting your eyes causes blurring. It's called the diffraction limit, the narrower the opening the blurrier the image. However, this would only be a problem when the pupils are very narrow, which for a cat is during the day when they don't need perfect vision anyways.
This is a large part of why space telescopes are so large, the bigger the opening the less blurry, and therefore the more you can zoom in and still get a good image. It's also the reason why it's actually harder to see if it's too bright.
What a show. I'd love to have this as a kid, but still enjoying it nowadays. Makes a grown man curious.
this video is a hidden gem. very interesting
Many thanks. lots more at ua-cam.com/users/curiosityshow - spread the word - Rob
There's more to the story of pupils than hinted at here. A slit pupil will introduce diffraction that is of a larger magnitude perpendicular to the slit orientation. If the slit narrows sufficiently, this will have an impact upon resolving power. Take the cat's vertical pupil. When narrowed down, an image of a point source on the retina will have diffraction of light somewhat 'smearing' the point horizontally; in the vertical direction no such smearing will be discerned. When the slit has narrowed to a bit less than 1mm, this diffractive impairment to image fine-scale contrast/resolving power will manifest.
However. Nature does not always make every eye to the correct dimensions in all respects. Eyeglass wearers can attest to that! Before eyeglasses were invented, folk with near- or far-sightedness, or with bad astigmatism, often found that squinting would sharpen the image helpfully. Here's where the narrowed iris--circular or slit--comes to the aid of a creature suffering vision defects. A smaller entrance pupil causes to utilize a smaller area of the compromised lens/cornea, which smaller area introduces a lesser magnitude of aberrations. For even a tiny iris (in bright light) any diffraction which might slightly impair resolution for a fully functional eye is, to the myopic/presbyopic/astigmatic eye, a rather lesser defect to suffer. And if the iris is not quite small enough for diffraction to be an issue at all, the sharper image is a definite boon.
Back to the cat, and its vertical slit iris. Leaving diffraction out of it (which in any event is a minor aberration), and assuming non perfect vision, its daytime vision will have an image where resolution is better on the horizontal axis, and depth of focus is also better in the horizontal. That is, resolving power will be better on the axis perpendicular to the slit axis. If a grid of closely spaced lines is examined, the vertical lines will be more sharply resolved than will the horizontal lines.
That's what the pinhole/slithole camera is demonstrating here. The lack of a lens simulates a defective eye that cannot form a sharp, aberration-free image.
For those experimentally inclined, to appreciate diffraction you can view a daytime scene, or distant/angularly tiny lights at night through a variety of pinholes and thin slits poked/cut in tinfoil and held very close in front of your eye. For a hole diameter or slit width of about 1mm, diffraction becomes apparent. The smaller the aperture, the greater in magnitude the diffraction--and the dimmer the image.
i think the reason they didnt talk about that is that literally no one understands half of what you're talking about. yeah theres a lot more information to be had on topics, this channel isnt diving into the deep advanced physics or anything, its just like a 2 minutes little blip of hey, did you know this?
you're gunna need some visual aids with those paragraphs buddy.
@@Kugrox My little epistle wasn't intended to be a critique. I know that back in the day this show's primary audience was school kids. But probably more adults than kids watch these UA-cam snippets. ;) Anywhoo, I was just supplying extra info for those who might have more than a passing interest. I did describe a simple experiment one could easily do, which is in the spirit of these programs.
Cheers!
You could also relate it to diffraction patterns expressed by slit experiments done to show the wavelike properties of light, and how the pattern changes shape depending on the shape of the passage/iris. Such as in the slit experiment we get a repeating vertical pattern that translates horizontally because the slits were vertical and phased horizontally, but in cameras that use a circular opening we get repeating concentric circles. That is why changing the shape of the iris changes the shape of the out-of-focus elements in a photograph (like making a diy aperture in front or behind the lens changes how point-light sources appear away from the field of focus). How that plays in a similar fashion to vertical slits would be interesting to see illustrated, because the more finely-detailed effects aren’t really well-observed through a pinhole camera outside of viewing point-sources and in-focus elements, such as the one presented here in the video.
you write like a redditor
@@Kugrox i mean i don't think so tbh i graduated a few years back so i might not be the best example but from the majority of what they Further explained is pretty understandable.
That guy's sweater game is strong
Awesome show. Although i'm not that old, i can say they don't really make them like these anymore. Really interesting.
One thing this video left out is binocular vision. The reason the vertical slit is so advantageous to ambush predators is because they have forward-facing eyes, and the vertical slit greatly enhances their depth perception because they can precisely the measure distance to their target based on that overlapping area where both eyes see the same target. In contrast, animals with horizontal pupils tend to have side-facing eyes, with very little overlap, but a VERY wide field of vision. This allows them to detect a predator from nearly any direction. Depth perception doesn't matter as much to them because they just need to run away from whatever direction they detect the predator to be coming from.
This show is so cool and underrated, wish I had this show growing up
I wanna watch shows like this with my kids in the future
before google, there was Rob and Dean.
I loved this show when i was young. Really, really hated it if we got home from school a little late to catch it.
Very informative. I'm intrigued why lions have round pupils. I was under the impression that lions were nocturnal hunters.
I've never seen an lion(ess) hunt at night.
I've seen footage of lions investigate a tent at night if they smelled food but actual stalking was done during the day.
The science on this has moved on a bit since they did this show. Your proximity to the ground also comes into it.
@@Efemral links?
Big cats are also foragers. Slit pupils are more common in ambush hunters.
Slit pupils on hunting animals only occurs in animals which are small (cats, foxes) or very low to the ground, such as alligators. Big cats have round pupils. Seems to have something to do with how close you are to the ground.
Absolutely fascinating demonstration.
learned more in 4 min then in 12 years of school
Very kind. Lots more at ua-cam.com/users/curiosityshow - Rob
@@CuriosityShow wait... Is this really Rob!? That's so cool! You've made an excellent program. I'm watching for the first time as an adult and I can't get enough. It's a lot more interesting than most of the kids shows when I was young, here in Canada.
Yes, it is me. Deane and I do what we can to reply to posts - depending a bit on the volume (and sometimes the tenor of them . Keep watching and, if you haven't done so, why not subscribe to ua-cam.com/users/curiosityshow We post new stuff on Mon, Wed and Fri - Rob
@@CuriosityShow That's fantastic! Can't wait to see the next video!
Exactly why we watched this show in Primary school. I was in Primary school when this show was in TV - late 70s or so - and every week our class would file into the admin building, may have been the teachers lounge, I'm not sure, to watch this show. Awesome part of the school week
I wish shows like this were still around!
How am I 31 years old and never run across this information?
That was literally the easiest demonstration.
I've heard this explained numerous times now, but the way this gentleman presents and explains it is by far the best of all I've seen.
40 seconds in I thought "this is gonna be insanely educational"
was not wrong
I watched this as a kid. I’m just finding this now. Is still as cool now as it was then. Cheers cherieK 🦋🌈🐿🇦🇺
Thank you for explaining this without a single reference to the religion of evolution. I give you two thumbs up, a share AND a subscribe just for that. "Good show, Ol' boy!"
I got recommended this. Feels very retro and I like that I learn things lol reminds me of kids shows i used to watch growing up
Praise the Lord for creating all this wonders
Praise Rob and Deane!
Honestly, saying like and subscribe in replies instead of the video is not only a refreshing but also a genius idea at the same time. Not saying you can really sugar coat selling out yourself but I appreciate it.
I’ve discovered yet another little pocket of UA-cam happiness!
We need more shows like this on air again
Was amazed to hear it was both these guys uploading this to UA-cam - great stuff, I'm absolutely hooked.
I do wish there were more shows like this on these days cartoons are great but short little educational clips like this are really cool
THESE people are so wonderful and hard to come by. not only are they smart, they know HOW ato explain their smart. It’s like the PERFECT teacher 😍 it’s so frustrating (no offense) to have like those PhD professors in school who theoretically have so much knowledge but can’t explain well enough to teach. at least in my experience and what I’ve heard from others
Mark Z : *"Glad they're not talking about me"*
I dig this show man. What an easy and accessible way to learn.
I never missed an episode of Curiosity Show when I was young. I loved it. Still do!! Why did I like it? Well, I'm glad you asked...
This is actually a good experiment and way of looking at this perspective
I grew up with this show as a child absolutely awesome and so informational … It was another world back then … how much things can change in one generation is incredible!
This video explained something I've wondered for years in just a few minutes. Thanks!
I'm glad that both Internet and UA-cam exist, and I can watch this show in my country! Even though it's dated, the knowledge it gives is timeless!
I struggle to believe they couldn't have gotten a better image of the goat's pupil.. great show though
This makes so much sense.
wow. i love these shows. feels like im learning more in 2022 from oldschool shows than the whats out these days
I grew up watching this show. It was responsible for developing the thirst for knowledge that is still with me today. I still remember getting the books as birthday presents (Earth, Wind, Air and Fire). They had great experiments you could easily do at home.
Many thanks - that was the idea, although the only one that didn't sell out was fire - parental caution, I think - Rob
Explains it in such a way that’s super easy to remember.
Wow it’s been long since I’ve found Videos that keep me so focused and entertained. I loved this so much. I want cat eyes cuz I like the dark
That's actually super fascinating
This had been puzzling me for a long time. I knew it had to have something to do with prey vs. predator, but I couldn't figure it out. Then I saw this video recommended and I couldn't resist. Thanks for the concise and interesting explanation.
this was the very first clip I've seen from this show and channel. I've watched at least 20 other videos whenever youtube popped it up. I like the fantasy, the ideas, uniqueness, that it is for every age, it's new information and puzzles
Glad you enjoyed it - much appreciated - Rob
wow this was insightful! i never even thought about why this is so amazing. So what about a Bat, can't see well & must have slit pupil, but they fly at night ...
Great Video & Info TY!
I watched this show for years after school. I learnt so much from it
Wow this show is very entertaining and very informative, its explained in interesting way rather than school , i give rate10/10
I read somewhere that the slit helps with navigating their environment. Smaller cats and reptiles hunt in vertical grass and reeds, hence the vertical slit. I have no idea why cuttlefish eyes are W shaped.
shows of this had clean, good shows, presenters and sometimes i like to watch these over today's shows
This was not the info I was looking for: but this is information I needed.
This is the best description of why we have unique pupils as different types of species. Very well done and nostalgic 👏 👍🏻 👌🏻 😊
Once again, UA-cam recommending things I'll never watch, and nothing I prefer to watch.
Awesome...Just awesome
Wow that takes me back to being a wee lad and I loved the curiosity show x.x
I decided to watch this on a whim since this was in my recommended feed. Very fascinating!
Used to watch this show when I was around 10, 40 years ago roughly. Was a great show with them making science and math fun, the 2 of them were very smart blokes.
I like the retro filter and fuzzy sounds, it makes it more nostalgic to me.
Why did I think that when he rotated the tube the arrow would also rotate?
This is Australian TV in the 70s. We were brought up on this stuff.
It is a big part of why my generation is quite knowledgeable.
We were actually taught real stuff back then.
This is so much better than the videos made nowadays where there's too mch jumping around and distractions, it's such a clearer way to give information
This show needs to be on T.V. now or even in schools
Excellent content. Great presentation and explanation of concepts in very simple way. I have started binge watching the episodes. Kudos for your efforts to bring it to this platform.
This show is awesome. Clearly explained, with little hands on experiments. Time to binge.
That was super interesting and well demonstrated.
Ohhhhhhh...!! ..and here i was buying corrective glasses for all my goats.
Loved this show as a kid
Loved this show as a kid .❤️👍
DISCOVERING AFTER 7 YEARS! SO GOOD CONTENT!
Loving this. When I have kids with my girlfriend eventually, and when my sister and her husband have theirs, im gonna recommend watching this program.
I wish youtube was still like this.
Great video
I like how this show explains it like I'm 5. I appreciate that.
"and that's the goat'seye..uh the sheep's eye" I was giggling...I'm childish.
Loved this show as a kid. It would be on at 4pm after school.
This show is Amazing!! We need more show like this.
algorithm is finally giving this show what it truly deserves