“ Trees singing in the heart of Paris ? With this new creation, Théâtre du Châtelet, along with commissioning partner Louvre Abu Dhabi, invite you to immerse yourself in an artistic, sensory and civic experience. With the support of Bloomberg Philanthropies, fifty “augmented” trees will sing melodies specially recorded for the occasion. Only one condition : the quality of the air. If a certain level of air pollution is exceeded, the trees fall silent… unless the warm embrace of a passer-by gives them renewed life. "