[Teamancer]

Very cool, beautiful. I did a kids toy kind of thing like this using Unity for Android taking input from the handheld's accelerometer to make a sphere (ball) roll around (according to how the handheld device is tilted) and bump into targets.

As regards to "the water should eventually stand still" I found the accelerometer input to be sooo sensitive that even when you placed the handheld on a level surface (sussed out with a carpenter level) the sphere would slow down a lot but never stop moving.

A glass of water placed on a table eventually stops moving - according to our senses. But does it really?