flexagon

American  

[flek-suh-gon, -guhn] / ˈflɛk səˌgɒn, -gən /

noun

1. a three-dimensional figure having polygonal faces that is constructed from a folded sheet of paper in such a way that different faces are exposed when the figure is flexed along its folds.

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Etymology

Origin of flexagon

flex ¹ + -agon (as in hexagon, pentagon, etc.)

Example Sentences

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.”

From New York Times

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

From Scientific American

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

From Scientific American

This October 21, raise a flexagon to Martin Gardner.

From Scientific American