Leonardo da Vinci, Vitruvian Man, 1487
Leonardo da Vinci's Vitruvian Man is often used as a representation of symmetry in the human body and, by extension, the natural universe.
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"Studio del Corpo Umano - Leonardo da Vinci."
http://en.wikipedia.org/wiki/File:Studio_del_Corpo_Umano_-_Leonardo_da_Vinci.png
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