"Ahu" are stone platforms on which many moai sit. There are 313 known ahu and 125 of these carry moai. The biggest, Ahu Tongariki is 220 m (720 ft), and had the most (15) and tallest moai.
The assumption is that the right kind of society is an organic being not merely analogous to an organic being, but actually a living structure with appetites and digestions, instincts and passions, intelligence and reason.