Last year, I had a fairly popular post called Aural Illusion. Phil Plait, the Bad Astronomer of the Discover/Bad Astronomy blog, picked it up and, next thing I know, I'm getting hits from Siberia, Alice Springs, and Ouagadougou. Well, it took a year, but I've finally come across another, comparable illusion - only this one is optical. Check it out:
(discovered at Of Two Minds)
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