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This is an analogy for "Heat conduction". The stored energy in the
swinging pendulum is analogous to the "Heat energy" trapped in a single
atom. The moving table is analogous to both the infrared "photon"
component of heat transfer, and also the acoustic/mechanical "phonon"
component. (Perhaps we should mount magnets on the pendulum bobs, that way
the magnets could perform the "photon" transfer, while the wiggling table
would illustrate how "phonons" communicate heat between atoms.