Ancient Egyptian art refers to art produced in ancient Egypt between the 6th millennium BC and the 4th century AD, spanning from Prehistoric Egypt until the Christianization of Roman Egypt. It includes paintings, sculptures, drawings on papyrus, faience, jewelry, ivories, architecture, and other art media. It is also very conservative: the art style changed very little over time. Much of the surviving art comes from tombs and monuments, giving more insight into the ancient Egyptian afterlife beliefs. The ancient Egyptian language had no word for "art". Artworks served an essentially functional purpose that was bound with religion and ideology. To render a subject in art was to give it permanence. Therefore, ancient Egyptian art portrayed an idealized, unrealistic view of the world. There was no significant tradition of individual artistic expression since art served a wider and cosmic purpose of maintaining order (Ma'at). Art of Pre-Dynastic Egypt (6000–3000 BC) Pre-Dynastic Egypt, corresponding to the Neolithic period of the prehistory of Egypt, spanned from to the beginning of the Early Dynastic Period, around 3100 BC. Continued expansion of the desert forced the early ancestors of the Egyptians to settle around the Nile and adopt a more sedentary lifestyle during the Neolithic. The period from 9000 to 6000 BC has left very little archaeological evidence, but around 6000 BC, Neolithic settlements began to appear all over Egypt. Studies based on morphological, genetic, and archaeological data have attributed these settlements to migrants from the Fertile Crescent returning during the Neolithic Revolution, bringing agriculture to the region. Merimde culture (5000–4200 BC) From about 5000 to 4200 BC, the Merimde culture, known only from a large settlement site at the edge of the Western Nile Delta, flourished in Lower Egypt. The culture has strong connections to the Faiyum A culture as well as the Levant. People lived in small huts, produced simple undecorated pottery, and had stone tools. Cattle, sheep, goats, and pigs were raised, and wheat, sorghum and barley were planted. The Merimde people buried their dead within the settlement and produced clay figurines. The first Egyptian life-size head made of clay comes from Merimde. Badarian culture (4400–4000 BC) The Badarian culture, from about 4400 to 4000 BC, is named for the Badari site near Der Tasa. It followed the Tasian culture (c. 4500 BC) but was so similar that many consider them one continuous period. The Badarian culture continued to produce blacktop-ware pottery