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.)

I used a parallel light source to ensure exact uniform lighting.

I'm not sure mine is as baffling as the original, but maybe that's just
because I've been staring at it too long...

 - Slime
 [ http://www.slimeland.com/ ]

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