Wouldn't be caught dead with a Little Tree hanging from your rearview mirror? Diptyque has the luxury alternative: a new car diffuser (it appears to hold the same cartridges as the Un Air de Diptyque electric home diffuser): "A new addition joins our extensive home collection. Our novel car diffuser is artistic and sophisticated and uses an innovative system of cold diffusion. Simply attach to the car ventilation to start a cycle. Thanks to the movement of the metal grid, it is possible to adjust the intensity of the fragrance to your preference." $60, with the cartridges ($38 each) sold separately.