Reverse Graffiti Project "He calls himself Moose, and his artform is reverse graffiti. No paint. No defacing. He creates by cleaning, by removing pollution, and leaving things the way they're meant to be. On April 14, Paul 'Moose' Curtis, commissioned by Green Works natural cleaners, created an outdoor mural in San Francisco's Broadway Tunnel. Moose worked through the night to clean a nature-scape into pollution caked walls, while critically acclaimed filmmaker Doug Pray documented the event. The result was an environmentally friendly work of art and a viral film about a philosophy of clean that went far beyond the sooty walls of one city."