Scientists at the Max Planck Institute for Dynamics and Self-Organization in Göttingen have found out, that the rhythm is the result of micro-delays in musical timing. The results are published in 'Nature'.
See:
https://www.ds.mpg.de/swing
https://www.nature.com/articles/s42005-022-00995-z
Michel Graillier: In A Spring Way. Red Record VPA 133 [1978]
Note: There is a recording „Marion Brown: Solo et duo avec Michel Graillier“ Marge 21 [1984], but unissued!
PS. The name on the cover is misspelled - correct: Graillier
Saw the Marius Neset Quartet on November 8th, 2013 at the 36th Göttingen Jazz Festival. But he didn't jump ... ☹️ Line-up: Marius Neset (ts), Erlend Slettevoll (p), Petter Eldh (b), Gerd Nilssen (dr)