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Ebbinghaus Illusion

http://en.wikipedia.org/wiki/Image:Ebbinghaus_Illusion.jpg
Image: Wikimedia Commons

An optical illusion. Circles A and B are the same size.

August 4, 2006July 18, 2013 | Oddities

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Futility Closet is a collection of entertaining curiosities in history, literature, language, art, philosophy, and mathematics, designed to help you waste time as enjoyably as possible.

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