Graffiti, the process of scratching, scrawling, painting, or marking images or letters in any manner on property, has existed since the Roman Empire, and has evolved into much more than simple scratch marks. Some people think of it as vandalism (defacing property), others as art, and for others it's a movement of its own. You can see from a recent CitizenSugar poll about British graffiti artist Banksy, the consensus is largely divided. If you have the chance to check out the film Beautiful Losers, which is in theaters now, you'll see that for some, graffiti is truly an art medium. While some graffiti is often reviled by authorities, other work is heralded for encouraging creativity and for the sense of community it builds. To see a few examples of these, check out this slideshow.