Martin Gardner used to be the Mathematical Games columnist of Scientific American magazine. His 100th birthday is celebrated this month with a dedicated series of articles on the man and the math and puzzles he introduced in the magazine. As an illustration, here’s Make Your Own Hexaflexagons…and Snap Pictures of Them
What a word: hexaflexagon! And hexahexaflexagons exist as well… More details about these and other flexagons can found on the Wikipedia, and beyond on the Web.