Rotating Tetrahedrons, designed by Tomoko Fuse

This origami model is a fidget.  You can rotate the tetrahedrons endlessly.  Kids love it.  They don’t last forever, but that’s okay, just make more!  I actually have a bunch of these lying around, because I include it in my origami class.

If you’d like to try this one, I recommend this Happy Origami video.  It’s also possible to make one with a single sheet of paper, but I wouldn’t recommend it.  This particular version uses six sheets of paper, so I can get the rainbow colors in, but it’s a bit of a challenge, so I don’t recommend it on first attempt.