Rather simple, if you want it to be. Want to know how to decide if a thing is art? One metric is the above: is it new in the world?
Crosswalks and dividing lane markers are painted lines, but rarely, if ever, artful. But my selection of a few of them and how and when I frame them can suddenly be.
Exact copies are less art the more exacting they are. Drawings and paintings copying other drawings and paintings are often much more so, in the changes in line and pressure, in the details left out (deliberately or otherwise).
Music is similar. Is hip-hop, when it builds itself out of other music in chunks art? Of course it is. It’s collage. It’s definitely new.
This is a broad definition, but I think we could do with a bit more of that. More generosity is a good thing.