Practical Sprite Sky

Greek praktikós, practical — adjectival suffix -al. As a color modifier, practical implies a clear-and-purpose-fit-and-everyday quality where the hue carries the visual register of Shaker-and-Quaker utilitarian-and-functional everyday-life craft. Sits at the crisp-and-functional end of the grid, parallel to functional and workmanlike in usage.

Latin spiritus, spirit-or-elf. As a color modifier, sprite implies a fairy-elf-and-quick-and-impish quality, the visual register of English-folk-sprite-and-Shakespearean-Puck hand-fairy-elf-and-quick-and-impish English-folk-sprite-and-Shakespearean-Puck-and-Midsummer-Night sprite-and-fairy-elf-and-quick-and-impish surfaces under English-folk-sprite-and-Shakespearean-Puck-and-Midsummer-Night greenwood-and-elven-meadow fairy-revel-light. Sits at the modifier-and-myth end of the grid, parallel to pixie and faun 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.