More Spirograph

Here is the Wikipedia gif again (take a look to see the animation). In the post above the S2 on the bottom is the "Ring" and the top S2 (spinning on the platform) is the wheel.

The other photos show some other ideas and more... Super Spirograph shapes.

Think - spinning wheel traveling an oval ring or a spinning wheel traveling a triangle or star path in place of the ring.

Spirograph gif via Wikipedia