example, the bamana sand divination uses well established symbolic codes that can be reproduced using four bits or marks. A binary system of one or two marks are combined. Random outcomes are generated using a fractal recursive process. It is analogous to a digital circuit but can be reproduced on any surface with one or two marks. This system is widespread in sub-Saharan Africa. Culture Sub-Saharan Africa is diverse, with many communities, villages, and cities, each with their own beliefs and traditions. Traditional African Societies are communal, they believe that the needs of the many far outweigh an individual needs and achievements. Basically, an individual's keep must be shared with other extended family members. Extended families are made up of various individuals and families who have shared responsibilities within the community. This extended family is one of the core aspects of every African community. "An African will refer to an older person as auntie or uncle. Siblings of parents will be called father or mother rather than uncle and aunt. Cousins will be called brother or sister". This system can be very difficult for outsiders to understand; however, it is no less important. "Also reflecting their communal ethic, Africans are reluctant to stand out in a crowd or to appear different from their neighbors or colleagues, a result of social pressure to avoid offense to group standards and traditions." Women also have a very important role in African culture because they take care of the house and children. Traditionally, in many cultures "men do the heavy work of clearing and plowing the land, women sow the seeds, tend the fields, harvest the crops, haul the water, and bear the major burden for growing the family's food". Despite their work in the fields, women are expected to be subservient to men in some African cultures. "When young women migrate to cities, this imbalance between the sexes, as well as financial need, often causes young women of lower economic status, who lack education and job training, to have sexual relationships with older men who are established in their work or profession and can afford to support a girlfriend or two". Art The oldest abstract art in the world is a shell necklace, dated to 82,000 years, in the Cave of Pigeons in Taforalt, eastern Morocco. The second-oldest abstract form of art, and the oldest rock art, is found in the Blombos Cave