The design for the extension of the Alliés de Chavannes nursery school draws on its context within the landscape and its integration within the site. The three new volumes that house the extension connect to the longitudinal circulation of the existing building in such a way as to allow them to be perceived as separate pavilions. The existing building is reconfigured to become the school's spine. Distinguished by two types of metal cladding - galvanized steel and anthracite zinc - the new volumes provide a visible distinction between the original building and its extension.