The project conserves two limestone walls from the previous building (1934), and houses a planetarium, a rain forest habitat and an aquarium, and several exhibition spaces to house the several Academy collections.
The planetarium and the bubble that contains the rain forest habitat are the two big spheres that shape the green roof. The roof becomes a landscape with California native species, that won´t need extra maitenance or water, attracting local species to occupy it. Thus, the green roof won´t be fully accesible to visitors, who can only walk through a small path.
Via association concert urbain