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TR-8203
A miniature solid brass cube is threaded on a string. It slides freely up and down on the string. Yet whenever the performer wishes, he can make the cube freeze on the string at any spot. The cube can be handed over for examination, and the spectator w
$4.95
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
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