"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.
We know the parental support, community support, makes a difference. It's not just the metrics of testing and putting pressure on the schools and on the teachers.
Architecture is involved with the world, but at the same time it has a certain autonomy. This autonomy cannot be explained in terms of traditional logic because the most interesting parts of the work are non-verbal. They operate within the terms of the work, like any art.