hexaflexagon:  a folded geometric figure made of six tetrahedrons that can be ‘flexed’ to expose many sides.

This video from ViHart is just. so. cool.

Hexaflexagon Safety – a humorous look at the dangers of hexaflexagons.

Because Vi’s video is so fast, its hard to follow her instructions to make a hexaflexagon.  Here’s a link for instructions.

Here’s a printable pattern.

And finally, a pattern with designs to color in.

Have fun!