An interdisciplinary team is currently building what are billed as the world's first 'living buildings' in Milan: two apartment towers with balconies planted with over 800 trees and 5,000 shrubs. But to make them wind-resistant, these mini forests need to be rooted in a special soil that's also lightweight enough for the building to withstand.
A team of researchers developed a formula containing volcanic rock, which supplies the greenery with the necessary nutrients. A special grid was also designed to secure the roots in the soil. The architects' vision is to bring nature into the city center and make Milan a green city.