I agree with Weitz and how he feels about the definition of art. I think it's true that you can define sub-domains of art all you want but to add a general definition to art isn't the answer. Although there are some necessary conditions needed to be able to classify something, even at rare times those conditions are disregarded and an object can still obtain the stature of being considered art. We can't seem to come up with a definition that doesn't exclude certain things. This is the reason art should remain an open concept.