Meet the hexaflexagon. It’s about to blow your mind.
►http://io9.com/5947852/this-is-a-hexaflexagon-its-about-to-blow-your-mind
Remember the first time you saw a Möbius strip (the ring-shaped surface with only one side) and it felt like your world had been turned upside down? The hexaflexagon tends to have a similar effect. Only more so.
►http://www.youtube.com/watch?feature=player_embedded&v=VIVIegSt81k
#mathématiques #géométrie via @vinci