Rural Mixtec speakers reside in village communities. Some of these communities form municipalities (the basic unit of political organization within Mexico), and some are hamlets within municipalities. In physical terms, most village communities have at their centers a main plaza surrounded by a church, a schoolhouse, and government buildings. Domestic dwellings are traditionally built of locally available materials. In higher, colder areas, most people tend to live in log cabins, but in the warmer, lower-lying areas, houses are usually made of cane and thatch. Adobe bricks are used throughout the region, and in some areas the waterproof husk of the banana is used as a roofing material. Today, many people construct their homes of cement cinder blocks and corrugated iron roofs.