Love it or hate it, graffiti has revolutionized the way we think of art. It is anarchic, untamed, ephemeral at times, and difficult. Like the impressionists before them, graffiti artists take art to the streets, only in a much more literal way. Their works show up over night, and many times disappear even quicker, erased by the authorities, in what some might call a misguided attempt at keeping the community clean.