"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.
Prayer is a fine, delicate instrument. To use it right is a great art, a holy art. There is perhaps no greater art than the art of prayer. Yet the least gifted, the uneducated and the poor can cultivate the holy art of prayer.