I have this blue glitter ball at school. It is big and round and it filled with water and glitter.
I love to let all the glitter sink to the bottom and then turn it over quickly to make the glitter fall. It looks like smoke the way it curls up to sink to the bottom.
This ball also bounces. It is so much fun and I have it right next to my computer at my desk so I have easy access to it when I feel the urge to turn it over. It is quite addictive, really.