"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.
A good poem is a contribution to reality. The world is never the same once a good poem has been added to it. A good poem helps to change the shape and significance of the universe, helps to extend everyone's knowledge of himself and the world around him.