I’m trying to tell you the story of my strange life,” the artist Michael Heizer said to me. “I’m not sure how much I want everyone to know, but it’s all going to come out.” It was March in New York, a cold, long-shadowed afternoon, and Heizer, who has spent much of the past half century on a remote ranch in Nevada, working on “City,” a mile-and-a-halflong sculpture that almost no one has seen, had finished an omelette and a tarte tatin at Balthazar. With his dealer, Kara Vander Weg, of the Gagosian gallery, he shuffled down Spring Street toward Greene, where he’d been renting a loft since the fall. He is seventy-one, and walking pains him.
At a crosswalk, Heizer—ravaged, needy, fierce, suspicious, witty, loyal, sly, and pure—leaned against…