Surface design with geometrical functions | Grasshopper 3D

There is a quite interesting way in Grasshopper to design 3D surfaces employing functions with one or two variables. In this video I am demonstrating how to set up GH definition to generate 3D surfaces with geometrical functions (two variable inputs). You can try more interesting expressions and extract more creative surfaces. Some of them you can find here: www.monroecc.e...
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[@thefutureisnow8767]

The expression produces only values. Why?