"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.
There are no accidents so unlucky from which clever people are not able to reap some advantage, and none so lucky that the foolish are not able to turn them to their own disadvantage.