The palette is the view from the bow: deep-channel navy for structure, lagoon cyan for everything alive, coral sand as ground, and the hibiscus flower exactly where Tongans wear it: one bright accent, never a bouquet. Gabarito is rounded like boat-transom lettering; Chakra Petch crackles like channel 26 on the morning net. The flukes divider dives through the swell between every chapter.
Two recurring devices: the flukes divider, a humpback tail diving through a running lagoon swell, and the mooring buoy as section numeral, waterlined in shadow. The mark raises a fluke between two island humps above the swell.