Every bounce makes the ball bigger

The ball grows 7% bigger with every bounce until it fills the whole shape.

How it works

The ball starts small and bounces inside a circle. Each bounce multiplies its radius by 1.07, so growth is exponential: slow at first, then very fast. When the ball is too big to move, the video ends and loops.

Questions

Why does it seem to speed up at the end?

Growth compounds. A 7% increase on a bigger ball is a bigger jump, so the last few bounces change the size far more than the first ones.

Is this real physics or an animation?

It is a physics simulation. Collisions are computed 60 times per second from gravity, velocity and bounce rules, then drawn. Nothing is hand-animated.

Will it look the same every time?

Yes. Each video uses a fixed random seed, so the same run plays identically every time, on this site and in the video.