"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.
Life holds so much, so much to be happy about always. Most people ask for happiness on condition. Happiness can be felt only if you don't set any conditions.