“This right here,” said the curly-haired, 20-something Apple Store glam-nerd who sold me my latest iPhone, “is the most important purchase you will ever make in your life.” He looked at me, trying to gauge whether the holiness of this moment had registered as he passed me the Eucharist with two firm, unblemished hands. “For real?” I said, trying to sound like a teenager, trying to mimic what all these devices and social media are trying to do, which is to restore in us the feelings of youth and control.“For real,” he said. And he was right. The device came out of the box and my world was transformed. I walked outside my book-ridden apartment. The first thing that happened was that New York fell away around me. It disappeared. Poof. The city I had tried to set to the page in three novels and counting, the hideously outmoded boulevardier aspect of noticing societal change in the gray asphalt prism of Manhattan’s eye, noticing how the clothes are draping the leg this season, how backsides are getting smaller above 59th Street and larger east of the Bowery, how the singsong of the city is turning slightly less Albanian on this corner and slightly more Fujianese on this one — all of it, finished. Now, an arrow threads its way up my colorful screen. The taco I hunger for is 1.3 miles away, 32 minutes of walking or 14 minutes if I manage to catch the F train. I follow the arrow taco-ward, staring at my iPhone the way I once glanced at humanity, with interest and anticipation.