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Toysmith Euler's Disk - 791709

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Price:
US $73.45
ApproximatelyAU $110.59
+ US $38.84 postage
Estimated delivery Wed, 10 Jul - Mon, 22 Jul
Returns:
30-day returns. Buyer pays for return postage.
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.