Note 13 — Chapter VII · HEREDITY, CLIMATE, AND CIVILIZATION

Of course this does not mean that the tribes beyond the edge are without culture. They would normally be under influences from other centers. And in a certain degree every people possesses initiative and is constantly tending to invent or produce culture, though perhaps only of a simple order. It is only from the point of view of the Southwest and its Pueblo focus that the extra-marginal tribes possess a zero culture.—For examples of other cultural step pyramids, see § 164, 175, Fig. 35.