The artistic intervention PLAY offers a window on the outside, a playful dialogue with the climatic conditions day after day. PLAY comes in three installations that interact with each other; a central mobile of a 120 small paper like planes, a cohort of boats sailing in a patio and a series of windmills arranged in the rooftop gardens ... These three interventions complement each other, the shapes and choice of materials follow a line coherent and simple creating a unit. The central mobile rotation speed is calculated in real time to match the actual wind speed on the roof. An anemometer is placed with the windmills.