Among other things, Slime saw fit to write:

> A version of this has been floating around on the web (google image search
> "same color illusion") and I felt like making a raytraced version. (This
> might have already been shown here, or even already raytraced by someone
> else.)

Brilliant! I've seen a coloured version of this illusion somewhere. It had
two Rubik-like cubes under coloured light, it showed we perceive equal
colours when they're not and vice-versa. Could you do that? ;-)

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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