Graffiti is almost always startling, regardless of whether I like the particular image. Even when it’s disturbing or ugly, I’m usually intrigued by the bright swaths of color and unusual, flowing shapes. Perhaps it’s the juxtaposition between the artwork and the illicit canvass that most grabs my attention. I’m no fan of the serious damage such artistic vandalism can do to private or public structures and favor rigorous enforcement of the law, but I nevertheless admire the seething, raw energy many of these painters express. It seems to me that there ought to be places where graffiti is welcome—on a wall or other structure set aside for the purpose—so long as it doesn’t offend whatever local standards a community wants to maintain. Like the boulders sometimes set aside for painting on college campuses, these places could be painted over and over again by whoever has the urge.