A pianist played in a tiny black room lined with flashing yellow lights meant to simulate bubbles. Jay McInerney had a booth — of course Jay McInerney had a booth — at which he encouraged partygoers to add to a story he'd started. And then there was Ann Veronica Janssens's yellow fog room, which was so thick with theatrical smoke one lost all sense of depth and perception. "I like being lost, both physically and metaphorically," Ingrid Sischy reflected afterward. The ballet came last, and it introduced Veuve's limited-edition, $2,000 "Yellowboam" bottle, twice as big as a magnum and outfitted with a label in ostrich, alligator, or stingray. An ex-marine–security guard tried to hoist one. "You could definitely club someone with that thing," he said. —Jada Yuan