After six years of work, the venerable museum in Boulogne-Billancourt is finally reopening. The program for this project, designed by Kengo Kuma, includes the rehabilitation of eight buildings, as well as the construction of a new one. As a common thread, the Japanese architect chose a traditional element of Japanese architecture: the “engawa”, a space bordering the exterior and the interior. The reinterpretation of this principle is developed throughout the site, and allows for a dialogue between the built heritage and the gardens using light wood, bamboo and metal. Materials that allow the engawa to blend into nature, to filter the views, while giving rise to areas of shade, in order to participate in the thermal comfort of the buildings.