At first it was music, then it became memory. He heard a child laughing at a pier he'd seen every day but never climbed; the voice was his sister's from years ago, younger, nearer. Another track unspooled a conversation he had with a stranger last winter, words he’d forgotten. The device seemed to be compiling fragments from the shoreline of people's lives—snatches of conversations, snore and sonar, the hush of someone crying into their pillow—wrapped in rhythms that made them beautiful and bearable.