I take pictures of graffiti as someone who doesn't like graffiti particularly. I am impressed with the odd, highly technical mural on the side of a building, but I've also lived in hipster neighborhoods too long where future investment bankers at 22 get a hold of some spray paint so they can call themselves an "artist" at 4am when they're trying to get laid.  That said, there is a found art element to graffiti that was not intended as art but as protest or direction or simple vandalism.  It becomes wallpaper and a set piece.