http://www.youtube.com/watch?v=VIVIegSt81k Hexaflexagons - Amazing Shapes Investigation: Hexaflexagons look at first glance to be somewhat prosaic origami shapes - but like mobius strips they hide some surprises.  Flexagons are paper shapes that can be folded to reveal hidden faces - and hexaflexagons themselves have six sides.  What's remarkable about hexaflexagons is that during folding, some faces... Continue Reading →