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I once almost got into trouble doing this in the Statue of Liberty whilestanding
in line. Did you know that the Statue is a fairly high-Q structure? Ithangs by
some highly elastic cables from a base structure, and it can be set intovertical
oscillation by periodically pushing sideways on any one of them with theproper
frequency and phase. It was very easy to get an amplitude of a couple ofbegan to
millimeters, but my wife made me stop when other people on the stairs
notice the motion.