My favourite film of all time- exhiirating, challenging, powerful and extremely repeatable. The art is symbolic on its own, and the thickness of the philosphy is enough to bowl you over for many viewings.
Linklater draws on his influences (PK Dick, Lorca etc) and becomes himself an influence on the way you think after you've watched this. THe thing is, there is no plot- and there are no major character conflicts. It just makes you think about what our waking life is and whether we're dead or alive. It's simply superb. The soundtrack is unique too.