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TR-5162
A cube threaded on a pair of strings falls freely, when the string is held vertically. But it stops whenever the performer or a spectator commands it to "STOP", then falls again when commanded to "GO". But then the performer
$9.95
TR-2165
The magician shows a ball which freely slides down on a thread. Whenever the magician so wishes, the ball stops sliding and freezes in place. Can be handed over to the spectator for examination, and there will be no way for him
$4.95
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