Graffiti started life as a protest, as a beautiful riot against the concrete jungle and the fences that isolated the poor from the rich. The midnight prophets of the subways and back alleys have so profoundly influenced our lives and touched the souls of our cities, that we have come to revere their visual poetry. And graffiti, for better or for worse, has become a beloved art form transforming the dull grey denizens of our city into exquisite canvases.