Jacques Coursil, trumpeter and star composer of the 1960s New York free jazz scene, interrupted his career for more than 40 years to devote himself to the philosophy of mathematics and Creole literature. For the first time, this film retraces the life and career of this famous musician. In the manner of his music, the atmosphere of the sequences, like juxtaposed photograms, suggest the Coursil of today. His personality is revealed in work with young musicians, as a duo with Archie Shepp, and during interviews or moments of musical improvisation. A film by Guillaume Dero.