Striking one tuning fork sets up a sympathetic vibration in the other, even though there is no physical contact between the two units.
This sympathetic resonance is seen here using a ping pong ball, which unambiguously moves.

It happens because the vibrations from the first instrument are similar to the natural vibrations of the second one: https://en.wikipedia.org/wiki/Sympathetic_resonance
Striking one tuning fork sets up a sympathetic vibration in the other, even though there is no physical contact between the two units. This sympathetic resonance is seen here using a ping pong ball, which unambiguously moves. It happens because the vibrations from the first instrument are similar to the natural vibrations of the second one: https://en.wikipedia.org/wiki/Sympathetic_resonance
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