Advertisements for prostitutes inscribed on walls in the ancient European cities of Ephesus and Pompeii show that graffiti has been with us since antiquity.

It wasn't until the 1980s that these informal public declarations were elevated from vandalism to art, as works by Jean-Michel Basquiat and Keith Haring entered the galleries. Now the irreverent art form has a

Read Julia Tanski's review at Bloomberg.com