If a tree falls down in the middle of the forest and nobody's around, does it make a sound?

[i]If a tree falls down in the middle of the forest and nobody's around, does it make a sound?[/i] "Yes, it makes a sound!" "But nobody is around!? " The whole point of this riddle is to clear your mind. It isn't a question with a yes or no answer. You ask yourself this question, your mind tries to figure it out coming up with conclusions and it's bottles your mind to the point where you cannot come up with an answer. Then, Your mind becomes blank. You've achieved temporary serenity.