MERLIN’S COFFER by Shigeru Sugawara

Product Description

1. A ball at the end of a string, a small metal ring, and a clear box: the ring is threaded on the string where the ball keeps it imprisoned.
2. The other end of the string is threaded through a hole in the lid of the box. Obviously, the ring cannot escape from the string.
3. Yet just one shake and that is what happens!