How to Prove Locke, Berkeley, and Hume Wrong

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It would make a sound. Sound is physical. It is molecules pushing against other molecules. Theoretically, you should be able to walk into the forest after the fact with very sensitive instruments and tell which sounds have been made and where they came from.

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Molecules pushing don't make sound -- an eardrum vibrating (and the brain interpreting) based on those waves creates the sound. No observer = no sound (if sound is defined as interpreting a "noise").

Conceded.
I was defining sound as a compression wave and nothing more.

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Conceded.
I was defining sound as a compression wave and nothing more.

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concur in that case