Now that I’ve mentioned it to her, Ms. Pacidal—an Amis Indigenous woman in her 80s—starts to fiddle with the watch on her left hand. It has a black, square, and boxy plastic face, on which shines a dimly lit screen that shows the date and time, location tracking services, and a daily step count. “It’s light,” she says. “In fact, almost forgettable!” It’s secured on Ms. Pacidal’s arm with a rubber strap, and she tells me that she has not taken it off for months.