Graffiti is largely illegal in most American communities, but that hasn't stopped street artists from rendering large and very public demonstrations of exquisite art. Some graffiti artists, among them Shepard Fairey, Jim Clay Harper, Danielle Bremner, and the mysterious British artist Banksy have become world famous. The Art of Graffiti discusses what today's artists are doing, how they attract a following, and what they are saying through their artwork.