"Painted murals first appeared in Latin America in the early 20th century; in the 1950s, spray-can graffiti associated with Latino gangs followed, notably the "cholo" graffiti of Los Angeles. Today, street art has traveled to nearly every corner of the globe, evolving into a highly complex and ornate art form. The World Atlas of Street Art and Graffiti is the definitive survey of international street art, focusing on the world's most influential urban artists and artworks."