Where is the line between art and not art?

The line between art and not arts is when it brings no new perspective. Change the perspective on how a subject has been seen, up until that point in time, and you have made art. Repeat an existing view of a subject without changing perspective and you have not made art. (This get's interesting when an artists subject is the "lack of art in the world". Perhaps he expresses this by copying a bunch of art in a way that highlights this, but simply painting another Mona Lisa on it's own is not art.)