One sun is yours. The rest are points on a photographic plate: you know where the light is, not what stands under it. Every world you hold produces a single stream of output, and the whole game is the argument over where it goes — into works, into the climate, into the yards, into the laboratories, or into the reserve.
Two to seven houses start the same way, as far apart as the plate allows, and none of them intend to share it. A small plate seats fewer: there must be lights enough to go round. The plate is ruled in hexes and wraps in both directions: sail off the right-hand edge and you come round on the left, off the top and you come round at the bottom. There is no back door and no safe corner.