By the time it gets to my favourite artists I have to salute Frederico Fellini. He was one of the most famous Italian art film directors second half of the twentieth century. In an interview he once said: "I am trying to free my work from certain constrictions – a story with a beginning, a development, an ending. It should be more like a poem with metre and cadence." I always disappear into the sheer abstractness of his images as though one is transported into a completely surreal experience.
Good examples are his Roma, Amarcord and Satyricon. I have seen similar ideas in the films of Andrei Tarkovsky and Lars von Trier although normally with more story structure that that of Fellini at his height.