Open Pluto 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.

Latin Pluto, Roman-god-of-underworld-and-dwarf-planet. As a color modifier, pluto implies a Roman-god-of-underworld-and-Kuiper-belt-dwarf-planet quality, the visual register of Roman-Pluto-and-New-Horizons-flyby hand-Roman-god-of-underworld-and-Kuiper-belt-dwarf-planet Roman-Pluto-and-New-Horizons-flyby-and-Tombaugh-Regio pluto-and-Roman-god-of-underworld surfaces under Roman-Pluto-and-New-Horizons-flyby-and-Tombaugh-Regio 2015-flyby-and-heart-shaped-Tombaugh-Regio dwarf-planet-light. Sits at the modifier-and-zodiac end of the grid, parallel to neptune and saturn 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.