Drag and throw the circles to make them move. I know it isn't very fancy... It's just that I was working on a simulation so that I could port it to a working 3d python program. With a few exeptions. In python, you have to do collision checking yourself. That will be pretty easy, but I was kinda lazy... :) However, it is pretty realistic. I had to think a lot to come up with the physics by myself...
