"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.
The mark of a good marriage is partnership and continuing to feel inspired by your spouse. I had that with Tao. But the end is not necessarily the tragedy. Staying in a relationship that is no longer working is the tragedy. Living unhappily - that's the tragedy.