What a colorful action toy this 3D Hexaflexagon design is! One definition of a Hexaflexagon is “paper hexagons folded from strips of paper which reveal different faces as they are flexed.”
You need three different colored papers – in this case blue, yellow and green – to see the changing shapes and colors.
As you push the squares inward, the shapes change. Keep pushing towards the center of the model and the changes continue until you get back to the cube-like form you started with in the beginning.
Watch the YouTube video to get the complete motion effect of the 3D Hexaflexagon and great instructions on how to create this Origami action model.