Education can be thought of as the transmission of the values and accumulated knowledge of a society. In this sense, it is equivalent to what social scientists term socialization or enculturation. Children—whether conceived among New Guinea tribespeople, the Renaissance Florentines, or the middle classes of Manhattan—are born without culture. Education is designed to guide them in learning a culture, molding their behavior in the ways of adulthood, and directing them toward their eventual role in society. In the most primitive cultures, there is often little formal learning—little of what one would ordinarily call school or classes or teachers. Instead, the entire environment and all activities are frequently viewed as schools and classes, and many or all adults act as teachers. As societies grow more complex, however, the quantity of knowledge to be passed on from one generation to the next becomes more than any one person can know, and, hence, there must evolve more selective and efficient means of cultural transmission. The outcome is formal education—the school and the specialist called the teacher.