While I feel in general most modern art is BS (ie. I went to a Mark Rothko exhibition in Paris recently and still don't 'get' it, that godly color theory application or whatnot) I do feel some of the turn of the 20th century stuff fascinating and highly creative - folks like Klimt for instance.

The way I think of it is taking the neurosis of the human mind and putting it out on a medium in all its glory. I don't have a deep knowledge of art history though so I'm not sure if there is much of a prior, I just am aware of the bigger movements.