A detailed architectural illustration showing three separate mechanical systems: top right, a large-scale steam-powered generator with a piston, boiler, and connected pipes feeding into a lightbulb; bottom left, a complex cylindrical engine with multiple pipes and belts; bottom right, a simple hand-cranked dynamo with a wooden base, coiled wire, and a rotating armature. All are rendered in a technical, cross-sectional style with small human figures for scale, characteristic of David Macaulay’s work.