Some fountains have the same shape as the juggling pattern, and the balls follow the same path that the water does:
http://previews.123rf.com/images/nesacera/nesacera1102/nesacera110200007/8802169-Classic-Fountain-Stock-Vector-fountain-water.jpg
http://www.rezasld.com/Portals/0/Gallery/Album/12/Fountain-Spray-Rings.jpg
by James Hennigan, in response to this post 2016-04-10 16:26:19