Pretty, but I'm confused. Shouldn't the whole screen share the same image, not just 2-corners at a time ?
the zero line is at the centre. therefore the top has a negative Y and the left has a negative X.
i could do that trivially. there is a " if mod>16 then mod=16" you can comment in the _update function. however there are only 16 colors so the pattern wont represent the actual function. it would be:
f(x,y) =((x*y)%mod)%16)
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