Two oscillating objects may be made to sustain a sympathetic resonance between them when each excites the other.
I saw this with the Dynasphere and a speaker box under the table where a string continued to oscillate with a given pitch from the speaker. Again I saw this as a water stream from a faucet falling upon a plate. The stream was perfectly whole and calm until the plate began to respond to the periodicity in the stream. The plate began to sound audibly and the stream breaks up striking the plate even more - thus they began to reinforce each other.
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