ART=represents something of the world, express or evoke emotion, please us by its form, and stand on its own as something autonomous and self-defining.
I found this the other day and thought it was appropriate to the way i view the definition of art. In Eric's example of the pile of rocks, I would say we, as the viewer can only say the final presentation. SInce I was not present at the rock arranging, nor was I present at the printing I can only judge the image I am presented with. Capanigro's rocks are a perfect example.