A soft chime, like a bell in a museum, announced completion. The app window opened to a sunlit parlor painted in faded teal. On a low table lay a wooden jigsaw board; dozens of painted pieces shimmered with impossible detail — a cityscape at dusk, lanterns, a narrow canal, a woman in a red scarf holding a photograph. A cursor hovered over a single piece and, where it pointed, the air smelled faintly of lemon oil and old paper.