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Optical Illusion

http://commons.wikimedia.org/wiki/File:Gradient-optical-illusion.svg
Image: Wikimedia Commons

An optical illusion. The gray bar is the same shade throughout.

September 17, 2005July 17, 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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