Some call it a plague and an eyesore; others consider it an expression of their basic rights. Some of it has deep political meaning, while some is a word or two written quickly marker. And it can be found all over the cities around the world: on rooftops, bridges, the walls of abandoned buildings. Graffiti and street art have been highly controversial forms of expression in New York for decades, hated by art snobs and building caretaker alike. The people who complain about it the most, however, are the city officials who clash with artists and taggers over their creations. Interestingly, this battle has done nothing to lessen street art's popularity. And now, some experts say, that popularity could do what city official couldn't: threaten the very essence of this short-lived art from.