recordings to test the old saw, "If a tree falls in the forest and no
one is there to hear it... does it make a sound?"
To me, this has always been obvious. When the tree falls, the
air vibrates, but there is no sound. Sound is an experience
generated by a subjective listener. If you record the air
vibrations, you have not proven that the tree made a sound.
The only sound in this case is that later made by a loudspeaker
in response to the recording, *when sensed* by a listener.
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