It's the centerpiece of the largest and astir costly backstage existent property improvement successful American history: "Vessel," a 150-foot-tall sculpture successful the mediate of Hudson Yards, a caller 16-building analyzable connected the West Side of Manhattan. The honeycombed formation of fancy, made of 154 flights of stairs, was conceived by 49- year-old British decorator Thomas Heatherwick, who has enactment his stamp connected immoderate of the astir provocative buildings and nationalist projects astir the world. Anthony Mason reports.