Yeah, but is it art?

In a way I think it is. What fascinates me the most is that graffiti is never seen being created, but is always noticed the next day, which means someone's doing it at night. And because it's always in an unlit area, they're doing it in the dark too. I think it takes a real talent to produce something like this at night, in the dark, and general quickly to avoid being caught. So irrespective of it's abstract concept, yes, I think it's art.