"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.
Continually one faces the horrible matter of making decisions. The solution ... Is, as far as possible, to avoid conscious rational decisions and choices; simply to do what you find yourself doing; to float in the great current of life with as little friction as possible; to allow things to settle themselves, as indeed they do with the most infallible certainty.
Except in very narrow cases, where there's breakthrough science that needs patent production, worrying about competitors is a waste of time. If you can't out iterate someone who is trying to copy you, you're toast anyway.
