Hold the ring one-handed in front of you, perpendicular to your body, and use the other hand to start the small rings spinning (it helps if they wobble rather than spinning freely). Then, quickly turn the ring hand-over-hand. As the rings fall down, they spiral along the large ring, and keep spinning. The potential energy they lose as they fall is converted into rotational kinetic energy, compensating for energy loss from friction. As you turn the large ring, you are constantly lifting the small rings back up, feeding more potential energy into the system to keep it going.

• Available pre-made

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