Akiyoshi Kitaoka, a professor of Pyschology at Ritsumeikan University, Kyoto, Japan, and the famed creator of the Rotating snakes illusion, has been updating his site since 2002 and it is full of intriguing color illusion.
I was experimenting with producing similar visuals with Processing , and by using recursive functions and arc() function I created this sketch.
It generates 18 “hands” and randomly changes thickness of separate “layers” of the figure. You can check openprocessing for the sourcecode. Afterwards I tweaked the sketch to produce .svg vector output and lasercut the resulting shape out of a 50x50cm piece of self adhesive vinyl. The result is very, very, VERY annoying to transport and apply to the wall, but produces a nice kitaokish effect as expected. Here are some pics and a wiggle-3d gif