At least, the inner crater ring was moving, and he assumed that the other rings were also rotating.

In solution, these rings rotate with a very low barrier.

In solution the rings rotate with a low energy barrier.

Three concentric rings rotate round each other on a stationary frame.

The ring rotated quickly about 80 cm above the ground.

Each selected ring will rotate either 90 or 180 degrees.

In doing so, the selected ring will cause neighboring rings to rotate as well.

These neighboring rings will rotate at a different rate and direction as the selected ring.

The ring was slowly rotating, together with the tables standing on it.

Each ring rotates independently of the others, yielding a possible 10 (or 100,000) different combinations.