Here are some photos of the playful fountains just to the south of the Centre Pompidou, in Place Igor Stravinski. Most of them move, for instance the big lips make a slow mechanical nod, and others turn while spouting water. They were created by Niki de St-Phalle and Jean Tinguely. The graffiti snake was high up on one of the walls surrounding the square; I like that it reflects the snake in the fountain.
When I was there, aside from the coffee drinkers, lots of people were sketching, a bunch of boys were playing football, and some other kids were playing an elastics game.