On every inhabited world, except Earth, the Seeders left a Temple. The Temple resembles a large sphere standing on a thin (4 inches in diameter) support leg, which ends in an ornament in the form of a hand, as if the hand is holding the sphere. The surface of the sphere is divided in black and mirror-like squares, alternating without any visible pattern; however, the design of the squares is identical on all Temples. It is physically impossible to destroy a Temple. After a civilization reaches a certain level of technological development, its Temple allows the supreme ruler of that world inside it and can grant his or her wishes.