My son and I have spent many hours photographing graffiti. I think it is one of the coolest arts going. Most of these people aren't "trained" as artists in the traditional sense which makes it even cooler to me. The trick - and the hard part - of course is keeping it legal. My son was involved in an organization that did public murals with the permission of the property owners and with public contributions in paints and $. Usually the murals had a political theme but sometimes they just got to do their monikers (I believe in the language of the graff artists "burners"). It's really hard to separate the tagging and vandalism from the other more purposeful kinds of graffiti because ultimately if they don't have permission, it's all illegal. My apologies to the train companies but I love the graffiti train cars the most. I've seen a car in one part of the country and a few weeks while traveling seen the same car in another.