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 I was thinking earlier about that saying that someone had mentioned in class. About if a tree falls in the forest and no one is there, does it make a sound? Sound is something that we perceive and interpret, so if no one is there to perceive it, no sounds is made. However, the waves that we perceive do exist, so something DOES exists and we just perceive it our own way. That being said, how different do other living things perceive sound and everything else? If something exists, but what exists is only what one perceives, then everyone and everything could be in a different reality and we wouldn't know. Our brain might interpret all information as something different than the next person....its possible...