Hole in the Victrola Disc

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"In closest packing of spheres only the first layer doesn't want to go anywhere-- to be neutral. At the third layer you get turbining.

"In the victrola record the edges turn but the center theoretically does not move. But you cannot demonstrate this phenomenon-- where the center of the axis is absolutely immobile-- in a three-dimensional model. It can only be demonstrated in a four-dimensional model like the vector equilibrium jitterbug."