"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.
One may know the four vedas and the dharma-sastras, yet if he has no realisation of his own spiritual self, he can be said to be like the ladle which stirs all kinds of foods but knows not the taste of any.