When we leave childhood behind, most of us stop seeing every street corner and park as a possible place to play.
Not "urban hacktivist" Florian Rivière. He still sees the potential for fun everywhere.
And he uses his artwork to turn city streets, objects, and even trash into invitations to play games.
Like this pond with slots for swim races.
Or this awesome-looking game of Ad-Kick, which is pretty self-explanatory.
It's not all lines on the ground, either. How about this cheeky reuse of a parked bicycle as a "free urban bicycle trainer"?
Or the punching bed, which offers a free way to take out a little aggression without hurting anyone else.
Even a piece of garbage can be transformed into something fun. All it takes is a little creative repackaging.
According to Florian's bio, he's "inspired by hacker, DIY and upcycling cultures," and his work "focuses on allowing citizens to reclaim their urban environments." Translation: one man's trash is another man's soccer ball.
So far his artwork has been confined to European cities, but we kind of hope he takes a trip across the pond sometime soon. Until then, here are a few more ideas for taking back the city and making it your playground: