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Place the ring onto the coil of the spring. Show how easy it is to lift it off and to drop it back on. When they try, the ring is threaded to the spring. It does not come off. As the spring is tightly wound which closed at both ends, it is clear that is not an option for removal. Again you show how it just lifts right off from in between the coil. Try as they might, they cannot remove the ring. This is a great pocket puzzle, yet reminiscent of the classic Chinese Linking Rings illusion.