Stan is very big, very old, and very popular. Roughly 65 million years young, Stan long ago retired from trampling, stalking, and gnawing across a steamy landscape of palms and gingkoes, and tussling with family. Like many other retirees, Stan now lives a life of quiet leisure. Stan hasn’t been lounging on the lido deck of a cruise ship, but rather soaking it in from a prime, street-facing perch at Christie’s auction house in New York City. In September and October, the Midtown flagship space was a pied-à-terre of sorts…