You're missing the forest for the trees. You're so fixed on one virtual object bouncing off another that you're missing the whole point. I'll spell it out one more time and then I'm going home. The things that rebound in iOS DO NOT in the real world. Thus, the virtualizaton of a real physical effect to indicate that you've reached the end of whatever you've reach the end of is novel and (successfully) patentable.
6/13/13 at 2:00pm