Realised learning (vidya) is our friend while travelling , the wife is a friend at home, medicine is the friend of a sick man, and meritorious deeds are the friends at death.
"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.