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He once went on a flexagon binge, courtesy of Mr. Gardner, who described flexagons as “polygons, folded from straight or crooked strips of paper, which have the fascinating property of changing their faces when they are flexed.”

Anyway, your friend shows you something you’ve never seen before: a big flexagon he’s made out of cloth.

This October 21, raise a flexagon to Martin Gardner.

Maybe other people would like to know about this flexagon thing.’