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Toysmith Euler's Disk - 791709

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Price:
$40.27
Free shipping
Estimated delivery Fri, May 24 - Tue, Jun 4
Returns:
30 days returns. Buyer pays for return shipping.
Condition:
New
Fascinating desktop illusions! Spin the holographic disk on the mirror. Does it speed up?. Listen to its rhythmic sounds. Why does the humming get louder as the speed of the disk increases?. Includes Euler's disk, 9" Concave mirror base and nine pieces of magnetized holographic foil.