Nan Madol rises from a fringing reef off Pohnpei's southeast shore, ninety-three artificial islets stacked from naturally hexagonal columnar basalt logs laid header-and-stretcher into walls that have held against tide and typhoon for a thousand years. The Saudeleur dynasty built it as a ceremonial and mortuary capital between roughly AD 900 and 1650, quarrying prismatic stone columns and rafting them across open water into a geometry no mortar has ever bound. This design system channels the wet grey-black basalt itself: cool, matte, weight-bearing stone mottled with moss and lichen, set against a shallow turquoise-teal lagoon. It favors stacked rectilinear structure, hexagonal facets, and a palette that never drifts warm — this is volcanic rock on a coral reef, not desert ruin.