PLANT

These hourglass-style structures consist of two disc-shaped living areas, each ten kilometers in diameter, which rotate around a central hub to produce artificial gravity. Each living area is anchored to the hub by a 30-kilometer central shaft and a network of high-tension strings, and a high-speed elevator runs up the central shaft to provide access to the hub. A set of external mirrors, attached to the central hub, are used to reflect sunlight into the inner surfaces of the living areas. The PLANTs are grouped into twelve sectors, or "cities," each with its own scientific or industrial specialty. These cities are named after the months of the Roman calendar, and each is made up of roughly ten individual PLANT settlements, which are referred to as Januarius One, Januarius Two, and so forth.