"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.
Racism oppresses its victims, but also binds the oppressors, who sear their consciences with more and more lies until they become prisoners of those lies. They cannot face the truth of human equality because it reveals the horror of the injustices they commit.