The Collected Animations of ICAF (2001-2006)

Anime with omnibus format that collects various animations from multiple different authors who showcase their style of direction and animation. The content is untraditional when compared to average anime visuals, so check it out if you're interested in experimental animation. 

Both are anthology collections showcasing a bunch of short experimental animations about various themes. Watch those if you're interested in artsy experimental anime, anthologies, or both. 

Collections of various short animation with different artstyles and animation styles. Check it out if you're interested in experimental anime. 

If you enjoy anthology collections of short experimental and artsy animations by various creators, then check out these two.