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Posted on August 28 2012 in drawing

<p>Escher for Real The Belvedere, Waterfall, Necker Cube, Penrose Triangle 3D Printing from Technion (by <a href="http://www.youtube.com/watch?v=cmr4HqjSSw4&amp;feature=player_embedded#!" target="_blank">Technion</a>)</p>

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