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(Mine!) I have a question... I have a question... I have a question!
Okay... So, if a tree falls in a forest,
and no-one's there, does it make a sound?
(Gastro) Yes it makes a sound.
(Mine!) Why?
(Gastro) Well, you see, it's rather a question whether sound is a techinical detail or merely a matter of perception.
Now, if you're counting it as a matter of perception, then yes, someone has to be there to hear it.
But for counting the sound as the manipulation of air waves and molecules bouncing off each other,
then no, nobody has to be there for a sound to exist.