"Freedom to express oneself is basic to American democracy, but graffiti has a long history dating back to Ancient Greece and Roman Empire."

"The term graffiti referred to the inscriptions, figure drawings, etc., found on the walls of ancient sepulchers or ruins, as in the Catacombs of Rome or at Pompeii. Usage of the word has evolved to include any graphics applied to surfaces in a manner that constitutes vandalism."

"The first known example of "modern style" graffiti survives in the ancient Greek city of Ephesus (in modern-day Turkey). Local guides say it is an advertisement for prostitution."

"Sometimes graffiti is employed to communicate social and political messages. To some, it is an art form worthy of display in galleries and exhibitions, to others it is merely vandalism."

"There are many different types and styles of graffiti and it is a rapidly evolving artform whose value is highly contested, being reviled by many authorities while also subject to protection, sometimes within the same jurisdiction." (Wikipedia)

Graffiti is it art or vandalism? Or maybe artistic vandalism.