"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 have been some medical schools in which somewhere along the assembly line, a faculty member has informed the students, not so much by what he said but by what he did, that there is an intimate relation between curing and caring.