"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.
And let me make this very clear - unlike President Obama, I will not raise taxes on the middle class. As president, I will protect the sanctity of life. I will honor the institution of marriage. And I will guarantee America's first liberty: the freedom of religion.
I think there was a revolution in poetry, associated chiefly with Eliot and Pound but maybe it is of the nature of revolutions or of the nature of history that their innovations should later come to look trivial or indistinguishable from technical tricks.