Just for the fun, here are some optical illusions with Grasshopper script. Warning it hurts.
The whole pattern, less moving to my point of view
Concentric circles making spirals
concentric circle wth square.gh
Parallel lines that seems not parallel
lines parallel .gh (16.1 KB)
Wow, these work great! Amazing!
This one is also not bad !!
And using tri remesher it works for whatever sphape
Some love is needed, grey shades instead of black and white (but rhino doesn’t like too many materials)
I remember having a book with similar stuff as a child. I wonder where it went.