The concept of reverse graffiti has been around for the past ten years or so, and the expressions clean tagging, dust tagging and grime writing are also sometimes used to refer to the same concept. Its main pioneer is UK artist Paul Curtis, who often goes by the pseudonym Moose. Curtis’ work has sparked a fair bit of debate, some admiring it as art, and others decrying it as vandalism. On occasions Curtis has faced the threat of prosecution but, so far, hasn’t had a case made successfully against him since, as he points out himself, ‘no-one owns the dirt’. More recently Curtis has gone commercial by creating eco-friendly advertising company Symbollix, which has been hired by a number of large companies (Coca-Cola, Smirnoff, UK’s Channel 4 and Microsoft) for their publicity campaigns.