I'm gonna have to watch WALL-E again at some point soon. It is crazy how much sound there is that filters into our ears constantly. I've noticed with some people that they have a real problem with sitting around in a silent atmosphere. If they don't have the tv on in the background, or some podcast, or some music going, they start to get anxious. Also, while I don't think it's necessarily a good piece of music per se, John Cage's 4'33" does make an interesting artistic statement about that fact.