Called Le Nuage Parfumé (or Perfumed Cloud), it is comprised of a cloud suspended in the middle of a large see-through glass cubical structure standing at the base of the Palais de Tokyo museum and Musée d’Art Moderne. The project is the brainchild of Mathilde Laurent, Cartier’s in-house perfumer, who wants fragrance to be viewed differently.
And it is. People may enter five at a time through an antechamber, so the closely regulated interior temperature — cool below and much warmer above — is maintained. Then, one by one they climb a twisting metal staircase, which rises through a tangible, suspended cloud scented with L’Envol de Cartier, a perfume conceived by Laurent.
Source: Cartier Conceives Perfumed Cloud