The seventh model, the submarine, had a hatch that lifted. Inside, a tiny paper sailor saluted. Kaito whispered a joke to the little figure, and the sailor’s paper eyelid folded down in a neat, conspiratorial blink. He laughed at his own astonishment and printed the last two models: an observatory and an atlas tower. The observatory’s dome rotated, revealing a paper sky peppered with constellations whose names matched the unfamiliar script in the library.