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    TED Talk - Beau Lotto: Optical illusions show how we see.

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    www.bookslut.com/...

    Nick Hanauer

    We drew the outline of a hand, very lightly in pencil, and then began drawing lines freehand across the paper. When part of the hand was in the way of the straight line, each artist had to "crawl over" their finger or hand with curves and arcs. The optical illusion became very obvious if the lines were close together and the curves fairly strong.

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