Most of his fans don't really want to know who he is (and have loudly protested ... to authenticate the real Banksy artwork, also protects him from prying outsiders. ... As I lay there listening to the cops on the tracks, I realized I had to cut my painting time ... I hate them trying to unmask him and find his true identity :
The answer is all of the above. By making the element stand out in a spot that attracts the most attention, the eye will naturally be drawn to it,i.e focusing.
