Warhol made the point himself : "So on one hand I really believe in empty spaces, but on the other hand, because I'm still making some art, I'm still making junk for people to put in their spaces that I believe should be empty : i.e., I'm helping people waste their space, when what I really want to do is help them empty their space" (The Philosophy of Andy Warhol). And again, quoted by Alan Jones in Art Press n°199 : "I think every painting should be the same size and the same color so they're all interchangeable and no-one should think he has a better or a worse picture than anyone else. And if the 'original picture' is good, they're all good."