Placid Stoa Lagoon

Latin placidus, gentle / quiet — derived from placēre (to please). As a color modifier, placid implies a clear-and-unruffled quality where the hue carries the visual register of mirror-smooth lake-surface in windless mid-morning. Sits at the crisp-and-calm end of the grid, parallel to serene and peaceful in usage.

Greek stoa, Greek-colonnaded-walkway. As a color modifier, stoa implies a Greek-and-Athens-colonnaded-walkway quality, the visual register of Athenian-Stoa-of-Attalos hand-built colonnaded-walkway-and-marketplace stoa-and-arcade-and-bouleuterion classical-Greek architectural surfaces under Athenian-Stoa-of-Attalos colonnaded-walkway light. Sits at the modifier-and-architecture end of the grid, parallel to agora and forum 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.