The film, commissioned by Fondazione Prada and oMA for the exhibition "Auguste Perret, Huit Chefs d'œuvre !/?– Architectures du béton armé" at the Palais d'Iéna, in 2014, is an intimate portrait of a masterpiece of the beginning of Auguste Perret's career: the building located on the 25 Bis, rue Franklin in Paris.

"25 bis" talks to us from a different point of view, searching for the intangible and subjective element of the building's history: the depht of the human print. naked from his permanence, the building appears as a sedimentation of life stories where each layer has left the trace of a passage.

From the intimate nature of these stories, the film draws this fragile and undefined essence that could be called "the place's soul".