Let me introduce you to Banksy. No, Banksy is not the rat sketched on the side of this building. Bansky is the artist who's artwork is displayed on the building. Bansky the man has been the center of a little controversy surrounding his gift.
What do we call this? Is it Art of Graffitti? As most people well known you certainly do not have to admire works by the likes of Van Gogh or Monet or even Picasso. As the saying goes 'Beauty is in the eyes of the beholder'. Well, I think the same can be said for Art as the appreciation of Art is surely in the eyes of that beholder who decides that it is art and something to be admired.
Now anyone knows what Graffitti looks like. Or do they? For me the word Graffitti summons up ghastly images of huge words sprawled wrecklessly destroying the appeal of a fences, homes and walls wherever there is space to spray, and minimal light in order to remain discreet while defacing someone else's property. But I do not see this as I view this guys creations. His work only enhances the street appeal - without the assistance of garish advertising billboards.