Photo: c/o MooseStreet artist Moose Benjamin Curtis was having some difficulty with the police. The officers had just arrested him for creating designs on a wall in South London. But it was complicated -- as things often are when Moose is involved. You see, Moose doesn't use spray paint or wallpaper paste -- the usual tools of this trade. Instead, he wields scrub brushes, old socks, cleaning fluid, and, when he's living large, a high-pressure hose. He creates images by cleaning shapes into filthy urban surfaces such as retaining walls, signs, and tunnels. People have called it "reverse graffiti," "clean …
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Greg Hanscom is a senior editor at Grist. He tweets about cities, bikes, transportation, policy, and sustainability at @ghanscom.