Frank is such a great visual storyteller, that if you study his artwork you see that his Sin City books are already the best movies never seen on the big screen.
"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.