looking for good avant garde anime or anime that can be taken seriously as art. Something that sets out to tackle a definite subject-matter instead of just trying to entertain you... I feel that I've already seen most of the good stuff that fits this criteria.
Some of my favorites that I consider 'serious' anime and have seen: blue submarine no.6, kite, angel's egg (and the rest of oshii's repertoire), shinsekai yori, night on the galactic railroad, kino no tabi, lain and other yoshitoshi abe works; haibane renmei, niea_7 etc

Any and all recs appreciated.