“In September, the art historian Douglas Crimp was speaking about his new book, Before Pictures, at the Whitney Museum when the slide projection was turned off and the screen rose, revealing the sunlight bobbing on the Hudson River and a view of Pier 52. It was there that, forty years prior, Gordon Matta-Clark had carved his monumental and illicit work Day’s End in an abandoned warehouse and Crimp had gone cruising for sex. The piers were known to be dangerous, Crimp writes, but at the time he had no fear of them, except the anxiety that their lure was distracting him from his work. Now the seventy-two-year-old was backlit against a thoroughfare of joggers and Citi Bike riders along Eleventh Avenue. The “vast and hauntingly beautiful” structures he describes had long ago been flattened into a parking lot for the Department of Sanitation.”