Intransitive Cadence

Found Matt Gentile's @Icondeposit post for the metal dial (http://dribbble.com/shots/227173-Dial-Tutorial-PSD- ), and decided to play around with that idea.

I left for lunch, and when I came back I noticed that the thing had turned black, and I could hear a low hum emanating from the screen. Can you hear it?

(feedback is appreciated, as always)