 If you liked
Ai (ONA)
|
 ...then you might like
Katsudou Shashin
|
Very short pieces of animation. Maybe the shortest out there.
Both do a good job of presenting the meaning of something too. The titles are self-explanatory as to what they present.
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Recommended by NextUniverse
short animes (less than 10 seconds) that have no story. 2 shortest animes of all time
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Recommended by Taubensperma