About blue
Blue is one of the three primary colours in the RYB colour model, as well as in the RGB (additive) colour model. It lies between violet and cyan on the spectrum of visible light. The eye perceives blue when observing light with a dominant wavelength between approximately 450 and 495 nanometres. Most blues contain a slight mixture of other colours; azure contains some green, while ultramarine contains some violet. The clear daytime sky and the deep sea appear blue because of an optical effect known as Rayleigh scattering. An optical effect called Tyndall effect explains blue eyes. Distant objects appear more blue because of another optical effect called aerial perspective.

Blue

landscape photo of mountain during nighttime
landscape photo of mountain during nighttime
panoramic photography of mountains
panoramic photography of mountains
blue abstract artwork
blue abstract artwork
a white butterfly on a black surface
a white butterfly on a black surface
body of water
body of water
blue and white striped textile
blue and white striped textile
blue Work Harder neon signage
blue Work Harder neon signage
round black metal table with chairs
round black metal table with chairs
a snowy landscape with trees and houses
a snowy landscape with trees and houses
blue wall bricks
blue wall bricks
white umbrella on ceiling
white umbrella on ceiling
portrait photography of yellow petaled flower
portrait photography of yellow petaled flower
white Ferris wheel under clear sky during daytime
white Ferris wheel under clear sky during daytime
a forest of trees
a forest of trees
mountain covering with clouds
mountain covering with clouds
jellyfish under water photo
jellyfish under water photo
body of water
body of water