For the Hutterites, the colony is the center of their world, and each must be laid out in accord with the basic principles of order and proper relationships. The colonies are named and are essentially large, self-sufficient prairie farms usually located not too close to one another so as to reduce friction but not too far so as to inhibit the exchange of services. Colonies are also located away from towns, although near enough that Hutterites can conveniently shop for equipment and supplies. Each colony has about fifty buildings including longhouses with three-room family apartments, a central kitchen, a kindergarten, school buildings, shops, sheds, and barns. Most colonies do not have a separate church building and services are usually held in a school building or community dining hall in the kitchen building. Colony landholdings range from a few thousand to sixteen thousand acres of land. When colonies reach their optimal size (about 130 to 150 people) a "daughter" colony is formed through a carefully planned and managed process, with half the costs borne by the parent colony.