"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.
I discovered that in a story I could safely dream any dream, hope any hope, go anywhere I pleased any time I pleased, fight any foe, win or lose, live or die. My stories created a safe experimental learning place.