Reposeful Knell Lagoon

Latin repōnere, to put back — adjectival suffix -ful. As a color modifier, reposeful implies a clear-and-restful-and-still quality, the calm color of pre-modern monastic cloister-and-refectory meditative-and-silent interior architecture. Sits at the crisp-and-calm end of the grid, parallel to peaceful and placid in usage.

Old English cnyll, funeral-bell. As a color modifier, knell implies a funeral-and-passing-bell quality, the visual register of English-funeral-and-passing-bell slow-and-tolling-funeral mourning-bell-and-bell-tower-tolling slow-and-mourning surfaces under slow-tolling-funeral-bell mourning candlelight. Sits at the modifier-and-time end of the grid, parallel to bell and vesper in usage.

A shallow body of saltwater partially or fully enclosed by a barrier — coral atoll lagoons in the Pacific, Venice's Laguna Veneta, the Florida Keys' backcountry. The color refers to the average reflectance of a calm tropical lagoon at midday: a saturated, slightly muted blue-green with the optical clarity of shallow water over white sand. Brighter than reef, cooler than aquamarine, with the postcard weight of a Pacific atoll seen from above.