Superfluid

Collection of films that present a strong or in depth portrayal in less than 2 minutes. These films might be short but they are able to leave a lasting impression even compared to some full length series.

Part 1 - https://myanimelist.net/stacks/9287
Part 2 - https://myanimelist.net/stacks/9289

No crap like Sayuri or flashing "dEeP" trash like Aki no Puzzle. Here you got what you've come for: nonsense, but the GOOD kind of nonsense. Detach your brain and enjoy. Most of it is rated PG-13 or lower so don't worry about getting stuff you shouldn't see in your eyes.

Requisites for addition:
Must be 45 minutes or less.
Must have avant-garde genre tag.
I must have rated it 7 or higher. Not compulsory though, if a short has the other requirements it might be here despite the rating I gave.
Flashing lights must be kept to a minimum.
Little to no explicit sexual content. Nudity is allowed only if it's not in a sexual context.
Little to no screamers nor sudden volume changes or ear-screeching sounds.
Of course I must have watched it entirely.

Side note: F for my sanity in making this stack, I have been watching some horrible stuff among the few enjoyable ones. Good grief.

This is a compilation of Avante-Garde shorts that are unique, mind-blowing and addicting. These will give you a different POV on the world of animation.
Includes short films, short series, commercials, station IDs, and specials.

Part 1: https://myanimelist.net/stacks/23559
Part 2: https://myanimelist.net/stacks/23560
Part 3: https://myanimelist.net/stacks/23563
Part 4: https://myanimelist.net/stacks/23564
Part 5: https://myanimelist.net/stacks/23566
Part 6: https://myanimelist.net/stacks/23567
Part 7: https://myanimelist.net/stacks/23568
Part 8: https://myanimelist.net/stacks/23569
Part 9: https://myanimelist.net/stacks/23571
Part 10: https://myanimelist.net/stacks/23573
Part 11: https://myanimelist.net/stacks/23575

No characters at all nor something that could be remotely called one here.
Most of them are music videos and/or avant-garde shorts.
And four of these are just cubes moving.