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Ehrenstein illusion

http://en.wikipedia.org/wiki/Image:Ehrenstein.gif
Image: Wikimedia Commons

An optical illusion. The square’s sides are straight.

July 16, 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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