Paper used in this video: 3 squares with a side length of 15 cm or 6 in
Finished model: diameter of 8.5 cm or 3 1/3 in, height of 3.75 cm or 1 1/2 in
This video describes how to fold a fantastic origami toy called "Rotating Tetrahedron" designed by Tomoko Fuse. It's a 3D flexagon, which you can play with for lots of fun.
Tomoko kindly gave me permission to make this video accessible to you.