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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If you move the fixed point, you'll get a wider or narrower ellipse? Now im heading to the bar to guess it out