I believe I answered this question a few days ago, but here goes:
According to a critical work entitled The Future of Modernism, Joyce articulated the aesthetic theories of Stephen Dedalus in his personal notebooks. The main principles are as follows:
- any theory of beauty must include the conventionally ugly
- art is neither immoral nor amoral but transcends conventional morality
- the work of art is a "selfcontained wholeness." I believe this means that art does not perform a social function, but is rather "art for art's sake."