wavelength:: 450-495 nm
emotion:: interest
the color of distance, depth, and exploration
evolutionary signal: sky, ocean, open water — safe horizons worth investigating
properties
lowers heart rate, reduces anxiety — the physiological opposite of red
promotes focused attention and creative thinking
the color of Rayleigh scattering — the sky is blue because short wavelengths scatter more
in nature
sky: the infinite frontier, the invitation to explore
ocean: depth, mystery, resources, travel routes
clear water: safe to drink, rich in fish
rare in land organisms — blue pigment is uncommon, often structural color (morpho butterflies)
in prysm
exploration, curiosity, unvisited territory, new particles to discover