RobinZ comments on Open Thread: May 2010, Part 2 - Less Wrong
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The "tree falling in a forest" question was posed before people knew that sound was caused by vibrations, or even that sound was a physical phenomenon. It wasn't asking the same question it's asking now. It may have been intended to ask, "Is sound a physical phenomenon?"
Do you have a citation for that? The earliest reference I see is Berkeley.
I don't. Sorry, I thought the question was medieval, but now can't remember why I thought that. Probably just from giving the question-asker the benefit of the doubt. If the original asker was Berkeley, then it was just a stupid question.