Shake to stop it. It seems a bit buggy but.. it works. Hold up with your arm across you like you're looking at the time at a slight tilt, to start it. Simple! This app stops working when you close out of it. Believe it or not this is a slight modification of a demo called acceldiscs and I made it my own :) I figured out an algorithm for shaking that's pretty nice. It can ignore the noise of subtle movements. Have fun and please give a heart if you like.