If I understand it correctly, The Wa is an art collective in France that consists of Alexandra Ross, Emmanuel Berque, Alain Bieber and Wang Ge. They create clever public art installations and advertisements, such as this crosswalk in the French city of Biarritz. If you're not paying attention while crossing the road, you'll go on a longer trip.
In 2012, The Wa attended Dockville, an annual music festival in Hamburg, Germany. The group collected trash from the festival, put it all into bright blue bags, then arranged the bags to display a message that could be seen from the air.
If you want people to pick up litter, make it a game. In 2011, The Wa created this public basketball court.
-via Rebel Art