Yesterday I listened to a recording made several years ago by my young student who is a master improviser. I recall my astonishment when he first played the piece at one of my studio "parties," wondering where he got the idea to write like that.
Yesterday I listened with greater objectivity: the piece is in 5/4, in itself truly astonishing. It holds together beautifully as an entity with a beginning, middle, and ending. It is completely convincing.
The nicest thing is that he still remembers it, plays it sometimes. We had a discussion about writing it down. I have never wanted to get involved in that process, as it is independent of the auditory sense of the music. He is a computer animator now and knows that that makes perfect sense.