Casually, I was visiting this site about optical illusions:

http://www.ritsumei.ac.jp/~akitaoka/index-e.html

just before reading the post from Sebastian with the unexpected optical
illusion, so I didn't resist the temptation to quickly try out with POV
some variations from one of Akiyoshi's illusions.

Warning: this effect can make you feel sick!

--
Jaime

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