In 1953 Robert Rauschenberg erased a drawing that Willem DeKooning had given him. Then he called the new work Erased DeKooning Drawing. Now I discover that graffiti artists in Brazil and the U.K. have found some new ways to erase their way into art history. Meanwhile they’ve been creating some pretty funny headaches for city officials who have to decide if cleaning a public surface can still amount to vandalism. Read all about it.