https://alexdrevessa.com/2019/10/31/tricky-hexaflexagons/
A quick explanation of the different ways to flex the HexaHexaflexagon, and how to cycle through to find all 6 faces. (My son is doing the explaining-- after I muffed about a dozen takes, he came over and used my hexahexaflexagon to demonstrate.) Vi Hart's creativity-inspiring video on this is here: https://vimeo.com/147799862
