This should be required viewing for everyone in the "art" world. Kitano skewers global modern art culture and also makes fun of his own work.
The story is simply of an artist from childhood to "middle age" (which seems to be around 62) as he tries to be a successful artist. He starts out as an untrained "primitive" but with a certain talent for texture and color. He is insulted at every turn while we get to see the "good" art by "masters" which are all really, really bad. Unfortunately the artist gets progressively worse as he takes advice from gallery owners on how to make his work "sellable", which it never is. Every time the work gets better, he's advised to go in a different direction. Many mildly humorous situations arise but the film isn't going for outright laughs most of the time. The scenes of the "middle aged" artist (played by Kitano) getting his supportive wife to make his art are very long, get progressively cruel (probably part of the point) and could have been cut down a little. The issue of autism isn't directly addressed but the character certainly exhibits symptoms.
This is a very good film although a little long. It may not be as good to someone who has no experience with the art world of today. Kitano created all the art in this film, good and purposely bad.