FLEXAGON THEORY

Flexagons are fascinating dynamic objects folded from strips of paper. In geometry, flexagons are flat models, usually constructed by folding strips of paper, that can be flexed or folded in certain ways to reveal faces besides the two that were originally on the back and front. They were discovered in 1939 by Arthur H. Stone but popularized by Martin Gardner, whose very first Scientific American article was about the hexaflexagon. Hexaflexagons come in great variety, distinguished by the number of faces that can be achieved by flexing the assembled figure.