"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.
Pioneers did not produce original works of art, because they were creating original human environments; they did not imagine utopias because they were shaping them.