Often the line between alternative street art and flat out graffiti is blurred in urban settings. While some cities are willing to promote a certain amount of creative expression, others are utterly intolerant of anything but un-touched walls and clean lines. But just un-touched does not necessarily correlate with clean, as in free of dirt and relatively hygienic. The dirt and grime that cover many urban landscapes, often uncared for by large municipalities, especially in low-income areas, has long been an issue of concern that provides negative reinforcement for poor standards of living for a large...