Heading for the Boundary

This ball is headed for the boundary to our left. A white ball is used In one-day cricket. A red ball is used for traditional five-day tests. There is a big to-do about the ball in cricket, but I'm not sure how it all works. The ball is replaced every so often during a game. Apparently, it gets rather dirty and deformed as the day wears on. A ball change can be requested if you think it will be to your advantage, I think. Anyway, this ball is rather dirty by now.