In Paris, the public transport company will build a new modern building. The architectural bureau that is preparing the plans for this building invited me to participate. The building will be very green and I will prepare a selection of plants and a plan for the greening of the secondary green facade, which will cover the sides and partially the roof. This will consist of climbers, with which it is necessary to capture the right balance between greenery or surface coverage and openness, so that enough natural light will enter the building.