The purpose of the competition was to build together on a residual urban plot an extension for each of the two schools located in a residential district of Courbevoie. We suggested to build each extension in keeping with the existing buildings, freeing ourselves from the masterplan drawn by the city council. Our project is made of two schools with two twin extensions gathering around a single playground. Both building have the same cladding material, thus creating a sense of unity in this heterogeneous neighborhood. A stained self-consolidating concrete base houses the ground floor, encloses the playground and bears two other metallic volumes. The façades of the raised volumes are cladded with a pattern of vertical elements made of anodized aluminum with champagne, bronze and gold colors.