This took me a second to figure out what they were doing, but when I finally understood it, I went “Holy crap:”
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Here’s a cool way to paper-fold an ellipse:
1) Cut a circle and fold it so that the circumference falls on a fixed point inside
2) Repeat this procedure using random folds pic.twitter.com/TAU50pvgll
— Fermat’s Library (@fermatslibrary) January 10, 2018″>