Making a film about a radio station doesn’t sound like the most visually compelling of projects. How many takes do you need before the acoustic transition from the opening to the closing of a door is perfect or the reader's voice correctly modulated? Nicolas Philibert has accepted the challenge to portray that which cannot be seen. Shouldering his camera, he spent half a year wandering the endless corridors of Radio France’s ‘round house’ on the banks of the Seine where he filmed people who dedicate themselves utterly and meticulously to their work.

Une plongée au cœur de Radio France, à la découverte de ce qui échappe habituellement aux regards : les mystères et les coulisses d’un média dont la matière même, le son, demeure invisible.