"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.
Some people think literature is high culture and that it should only have a small readership. I don't think so... I have to compete with popular culture, including TV, magazines, movies and video games.