I made something of a kinetic sculpture for a project in class. The problem is, I'm having trouble describing the physics principles behind it. Here is the kinetic sculpture in a nutshell, so to speak. A mini fan, powered by batteries, makes a propeller move. There's two "resonance chambers" of a windchime attached to the propeller, so while the propeller moves, the little chambers from the windchime make sound. Now, I was hoping to use torque, wave/sound, wind, friction, and energy, as my principles, but It's hard for me to explain, in terms of the project. Can anybody help me out?