Yes, Aeronautics, you can look at the physics of sound. But then you rule out one of the biggest philosophical issues, how can one be sure that that tree created sound without actually recording it? You see, as soon as you start to record something, you are actually witnessing it, and therefore you make the experiment invalid.

The whole point of the tree complex(if I got it right), was: How much does our perception of things influence the way the world is. YOu see, I am now looking at a screen, but how can one be sure that this computer screen is still here when there is nothing and noone to see it. You can't, that's why it's a philosophical dilemma. Normal physics can't solve it, since everything in physics revolves around things you witness....