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These heavy polished balls spins on a frictionless cushion of water and continues to roll until the water is shut off. Nevertheless, even a child can stop the marble balls (or granite balls) or change the direction of their spin, or set the ball on an accelerated twirl. The gap between the ball and the basin socket is about 1/4000th of an inch, so there is no danger of hurting child's fingers. It staggers everyone's imagination to see these extremely heavy balls revolve around on such little water, it is miracle of stone floating spheres invented in China.