Phosphorescent Eave Sky

Greek phōsphóros, light-bringer — adjectival suffix -escent. As a color modifier, phosphorescent implies a saturated-and-cool-glow-after-stimulation quality, the bright cool-green-blue color of Cu-doped-ZnS glow-in-the-dark photoluminescent surfaces. Sits at the bright-and-cool end of the grid, parallel to fluorescent and luminous in usage.

Old English efes, roof-edge. As a color modifier, eave implies a roof-overhang-and-edge quality, the visual register of Japanese-engawa-and-English-eave hand-built roof-overhang-and-edge eave-and-fascia-and-soffit architectural surfaces under Japanese-and-English eave-edge filtered light. Sits at the modifier-and-architecture end of the grid, parallel to gable and frieze in usage.

The blue of a clear sky at noon — produced by Rayleigh scattering, the preferential dispersion of shorter wavelengths through atmospheric molecules. Air itself is colorless; the color we see is sunlight scattered toward our eyes by every cubic kilometer above. The reference shade is mid-latitude noon under a high pressure system: a clean, slightly green-shifted blue with the luminous depth of light scattered across an entire hemisphere of air.