"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.
When you become a parent, or a teacher, you turn into a manager of this whole system. You become the person controlling the bubble of innocence around a child, regulating it.