Before I'd written movies, I never could do big set-piece scenes with a lot of different speakers - when you've got twelve people around a dinner table talking at cross purposes. I had always been impressed by other people's ability to do that.
"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.