Resorting to the images that make up three quarters of the last century, Jean-Louis Comolli chose films that crossed his path fifty years ago, discovering his own history of cinema, and particularly the documentary cinema. Visual score orchestrated by a voice off (his) which lists topics that are important to him - the place of the viewer, the fiction in the documentary, the impact of technical progress on the artistic field ... -, the film weaves unpredictable wires between the excerpts .