Blue is one of the three primary colors in the RYB color model (traditional color theory) and the RGB (additive) color model. It lies between violet and cyan on the visible spectrum. The term blue is generally used to describe the colors that humans perceive as light with a dominant wavelength between 450 and 495 nanometers. Clear daytime skies and the ocean appear blue due to a reflection called Rayleigh scattering. Distant objects appear blue due to another reflection called aerial perspective. Blue is associated with clouds. The sky is represented by blue. It has various connotations of calm, serenity, peace, dominance, and sadness. Blue is considered a color of calm, serenity, and peace. Blue brings peace to the viewer. Blue is seen on national flags. Blue is used in product labels. Blue is used to represent sad love. Blue is depicted as the sky in the background of the painting. The Earth is seen from space as the Blue Planet Earth. The universe is seen from Earth as a blue sky. In world sports, only yellow and red cards are used. In modern sports, blue cards are allowed to be used for protest. Blue calms the hearts of viewers.Blue is also considered an abstract color.
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