"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 think Damien Hirst is hilarious. And I think he's a true artist. He's not hilarious first I think he is a real artist, and I also think he's got an amazing sense of humor.