Hemmed Sill Lagoon

Old English hem, border — past-participle of hem. As a color modifier, hemmed implies a clear-and-finished-and-bordered quality where the hue carries the visual register of carefully-hemmed-and-finished textile-edge. Sits at the crisp-and-finished end of the grid, parallel to trim and finished in usage.

Old English syll, threshold-beam. As a color modifier, sill implies a horizontal-bottom-of-window-or-door quality, the visual register of English-cottage-and-farmhouse hand-cut horizontal-window-and-door bottom-edge sill-and-threshold architectural surfaces under English-cottage-and-farmhouse sill-edge light. Sits at the modifier-and-architecture end of the grid, parallel to lintel and truss 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.