A quick thought, inspired by the discussion here: many people apparently believe that "when you create something, you own it." Now, this has various ludicrous consequences when applied to mental creations. (Is it theft to hum a tune?) But we might avoid this problem by appealing to those philosophers who claim that melodies and such are discovered rather than created.
After all, we normally wouldn't hold that people get to own whatever they discover. (Einstein doesn't own the theory of relativity. Columbus doesn't own America.) So, if reasoning in the metaphysics of aesthetics leads us to conclude that artists discover pre-existing abstract forms, rather than "creating" their artworks, then this might significantly affect our legal and political philosophy, at least insofar as intellectual property is concerned. (Has anyone noticed this before?)