Graffiti has become much more than spray-painted tags and quickly disappearing pieces on train cars and underpasses. In some quarters it is now high art. Highly prized are works by Shepard Fairey, the artist behind the “Hope” poster Fairey made for Barack Obama’s presidential campaign, Jean-Michel Basquiat, who began as a graffiti artist and whose works today command huge prices, and Banksy, whose street works are carefully preserved.  These dramatic changes in the nature and … <Read More>