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RBF Definitions
“…Now along comes a third sphere and it nests in the valley. This makes a train of gears with each one geared to the next one. Even numbers of gears will always reciprocate and the odd numbers will always block. So no longer can those balls roll in a plane on the triangle which they form. If one tries to go one way it will make the next one go the other way; and one can’t be moving in two different ways, so odd numbers will always block.”
