Vernacular architecture is significantly and intricately influenced by the climate. A courtyard with a fountain or pond is a common feature in the Mediterranean and most Middle Eastern architecture. The natural ventilation created by the architectural shape draws air cooled by water mist and evaporation through the structure. Vernacular structures are commonly decorated in line with regional customs and beliefs, which has a significant impact on culture. For instance, the family units of many East African ethnic groups reside in family units that are defined by boundaries and where several single-roomed homes are built to accommodate all the various members of the family.