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Fraser Spiral

http://en.wikipedia.org/wiki/Image:Frasers.gif

An optical illusion. There’s no spiral, just concentric circles.

September 2, 2005December 12, 2010 | 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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