This Wonderful GIF Shows You How to Create a Perfect Ellipse by Repeatedly Folding a Circular Piece of Paper

This took me a second to figure out what they were doing, but when I finally understood it, I went "Holy crap:"

I don't pretend to understand the black geometric magic behind this trick, and I realize that knowing how to do this will save me from neither zombies nor North Korean missiles, but it's a pretty darn cool trick for the bar.

Via Kottke

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