Is it a coincidence? The City of Paris inaugurated the most important equipment dedicated to early childhood of its last mandate rue de la Justice in the 20th arrondissement. Designed by the BFV office, this 150-cradle nursery meets the city's objective of "doing things as fairly as possible" : more environmental performance, more efficiency in the optimization of surfaces and land and more control over investment and maintenance costs for more children cared for and with more attention to their well-being. The ambition of this nursery school deployed vertically and wrapped in a wooden mesh from the reuse of landing doors is precisely to reach the point of balance between urban, environmental and social issues.