The document traces the history of graffiti from the late 1960s to the present. It began as protest art in Philadelphia in the 1970s and grew significantly in popularity and scope in the 1980s. During the 1990s, police cracked down on graffiti, leading artists to shift to rooftop pieces and stickers. The document profiles influential graffiti artists from each decade and discusses current styles, media and citizen responses to graffiti, as well as policing and community efforts around the issue.