The principal aim of art is not, therefore, to imitate nature, to decorate our surroundings, to prompt us to engage in moral or political action, or to shock us out of our complacency. It is to allow us to contemplate and enjoy created images of our own spiritual freedom—images that are beautiful precisely because they give expression to our freedom. Art's purpose, in other words, is to enable us to bring to mind the truth about ourselves, and so to become aware of who we truly are. Art is there not just for art's sake, but for beauty's sake, that is, for the sake of a distinctively sensuous form of human self-expression and self-understanding.
http://plato.stanford.edu/entries/hegel-aesthetics/
