“New York graffiti is the stuff of legend. At least, it was: a messenger boy calling himself TAKI 183 is credited with launching the craze in the early 1970s, and later, when the city was fighting crime and recession, the scene exploded in the city’s subway. Keith Haring and Jean-Michel Basquiat brought it into the galleries in the 1980s. Then a succession of New York mayors cracked down.”