Stephen Ross calls it “my baby.” For the moment, it’s known as the Vessel—or, officially, as Vessel. (Ross longs for the public to give it an affectionate nickname.) One can think of it as a compressed extension of the High Line, or as the site of a perpetual evacuation drill; it’s a proposed future venue for downhill mountain-bike races. Starting sometime next year, it will be open to the public, via free, timed-entry tickets. Ross’s evident delight in the piece—even as some of his associates wonder about its size and purpose, and its cost, which exceeds a hundred and fifty million dollars—derives partly from his confidence that, in time, it will become “the icon for New York,” just as the Eiffel Tower is for Paris. The Vessel is about as wide as it is tall, and will fit nicely into an Instagram photograph.