I totaly disagree that graffiti artists were vandals!It's an impression of art! Graffiti was discovered in the ruins of Pompeii. In our days fraffitie makes a style of city more beautiful but sometimes it can be not so perfect!By the way a lot of artists weren't understood in their art for example Vincent Van Gogh!And I 'm sure in the future people will notice masterpieces not only in galleries but also on walls and urban trains!