G-9

Featuring little to no dialogue and/or characters and the experience is carried by the music and/or visual atmosphere.

Part 1 - https://myanimelist.net/stacks/311
Part 2 - https://myanimelist.net/stacks/5128
Part 3 - https://myanimelist.net/stacks/8036
Part 4 - https://myanimelist.net/stacks/8173
Part 5 - https://myanimelist.net/stacks/9135
Part 6 - https://myanimelist.net/stacks/9240
Part 7 - https://myanimelist.net/stacks/9448
Part 8 - https://myanimelist.net/stacks/9461
Part 9 - https://myanimelist.net/stacks/20874

Moe Nagata - https://myanimelist.net/forum/?topicid=2076686

画ニメ (Ga-nime) A series of experimental artistic films produced by Toei Animation in 2004-2007.

Note: The inclusion of Kono Shihai kara no Sotsugyou: Ozaki Yutaka to this list is based on the information on the now defunct page of the Toei website which lists it as Ga-nime unlike many other subsequent releases or collections.

http://corp.toei-anim.co.jp/english/film/ganime_yutaka_ozaki.php

Do you want to watch anime so artsy that will either relate to the deepest part of your soul or completely confuse you?
Well here you go, and since they are so short you don't have to feel like you wasted your time.

This list includes arthouse anime that are around 15 minutes or less, so movie length (Angel's Egg) or OVA/episode length (Cat Soup) are not in here.

Some of this may be a bit challenging to find, some are up on youtube and for some you'll have to get creative, buying or streaming them is probably out of the question.