I have passed this model many times, thinking “not sure what that is, maybe later”, but decided to give it a whirl tonight:

What a curious object. Designed by Jeremy Schafer, from his book “Origami to Astonish and Amaze”, this odd ripply mathematical conundrum hurts your brain to look at.

A fun paper manipulation first makes a nested tetrahedron, which is then accordion pleated to make the deltoid. You can then open it up like some surreal book, 4 separate rippled deltoids emerge – curious indeed. Continue reading →