If you happen by the Milwaukee River near Schlitz Park, you might notice a mural on what appears to be a giant water slide emptying into the river. The slide, of course, is an illusion created to draw attention to the mission of the Milwaukee Riverkeeper of restoring Milwaukee’s waterways.

The idea originated as a print ad created for a public service advertising competition. The entry was judged best in the contest and won a cash prize for the Milwaukee Riverkeeper organization as well as becoming the impetus for the actual mural creation.