I'm into photographing abandoned buildings, and the graffiti inside them is often incredibly artistic. Too bad that there's no publicly-sanctioned space for these artists to show off their work. Perhaps the illicitness of the process is part of the allure, but I can't imagine working that hard on something that would be seen by few. What's also notable is that, at least to my as a middle-class white guy, most graffiti doesn't seem gang-related. Most of the low-quality stuff probably is, but the good stuff is often something incredible like an abstract city skyline.