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Does quantum mechanics matter at everyday scales? We generally assume thatits consequences are confined to microscopic scales. It would be verysurprising if quantum effects were to be manifest in a macroscopic system. Thishas been claimed for the problem of balancing a pencil on its tip. The claimhas also been disputed. We argue that the behaviour of a tipping pencil can beexplained by the asymptotic properties of the complete elliptic function, andcan be understood in purely classical terms.

The Not-so-simple Pendulum: Balancing a Pencil on its Point