"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 technology that threatens to kill off books as we know them - the 'physical book,' a new phrase in our language - is also making the physical book capable of being more beautiful than books have been since the middle ages.