Sometimes we see him as other hotel guests would have seen him: as the tall gambler intent on the video poker machine across the casino floor, or as the customer standing in line in front of you at the gift shop, buying snacks, or as the guy you briefly glance at as he waits for you to get off the elevator — polite, unhurried, unmemorable. Sometimes we see him as the employees would have seen him, as the casually dressed V.I.P. with the many suitcases who jokes with bellhops, chats with valets and gives out tips along with handshakes. And...