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This wobbly spinner also called a "rattleback" features a physics defying unpredictability. Which makes it perfect for equally unsure decision making. Includes one 3¾" long rattle back and one 4½" wide decision disc.

This mechanism demonstrates a surprising way to generate an ellipse by using a four-bar linkage. The shape of the ellipse can be defined by the path the intersection point of the two crossing bars follows. This fact is analogous to another neat way…

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It's a Klein bottle 3D printed in resin in a pendent with a mobius strip tag.

Text by: David G. Haskell,
Illustrations by: Ellen Litwiller

Physical gift a small E link puzzle and a puzzle postcard.
Paper 'Multiplication by Superposition' - PuzzleAtomic.com

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