Open Jolly Lagoon

Old English open, unobstructed — used as a color modifier since the eighteenth century for hues that read as airy or uncrowded. Open blue, open green: moderate saturation combined with optical spaciousness, the slight visual breath of a hue that doesn't crowd the surface it covers. Sits at the crisp-bucket center alongside clear.

Old French jolif, festive-and-pretty. As a color modifier, jolly implies a hearty-and-warm-and-festive quality, the visual register of Dickens-Christmas-and-Falstaffian-jolly hand-hearty-and-warm-and-festive Dickens-Christmas-and-Falstaffian-and-Pickwickian jollied-and-hearty-and-warm-and-festive surfaces under Dickens-Christmas-and-Falstaffian-and-Pickwickian goose-and-plum-pudding-and-roaring-hearth Christmas-Eve-light. Sits at the modifier-and-mood end of the grid, parallel to merry and mirth 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.