Flexagons are interesting dynamic objects folded from strips of paper. They were discovered in 1939 by Arthur H. Stone but popularized by Martin Gardner, whose very first Scientific American article was about the hexaflexagon. A later Gardner column described its cousin, the square tetraflexagon. Since then, many generalizations of flexagons have been explored. Flexagons have been made out of a variety of triangles, squares, trapezoids, pentagons, hexagons, and other polygons. Different numbers of triangles arranged around the centre create the triangle pentaflexagon, octaflexagon, dodecaflexagon, etc. New patterns of folding, or “flexes,” have been discovered for manipulating these flexagons.