Baba uses the colour of the background to determine what's floor. So if you drag Baba onto an area with lots of one colour, Baba will think that that colour is "air" and fall down. Then if there's a different colour underneath Baba, Baba will think that the other colour's "floor" and stop. If your desktop background contains a lot of colours, Baba will think that the floor/air change very often and bounce more.