ّIt’s just after noon on an unbearably hot July day in Manhattan and the Four Seasons restaurant is bustling. The establishment’s iconic Pool Room — not a metaphor the room is defined by the bubbling marble pool in its centre — is filled with famous (or at least New York-famous) regulars: Paul Walter, the collector; Thom Browne, the fashion designer; Lee F. Mindel, the architect; Martha Stewart, the Martha Stewart. On the edges of the room, a legion of young,