The mirrors were on display at Sotheby’s global headquarters in advance of the sale. (Image credit: Courtesy Sotheby’s) There was a time when the contents of a room were understood as support: the chair beneath the painting, the mirror above the console, the cabinet holding the objects that mattered most. But the design market has been quietly rewriting that hierarchy. Increasingly, the room itself has become the collection. This spring, Sotheby’s made that shift impossible t