Blue is one of the colors of the rainbow that people can see. It is one of the three traditional primary colors, along with red and yellow. It has the shortest wavelength of these colors (about 470 nanometers).
Blue is the color of the earth's sky and sea. Earth looks blue when viewed from outer space by astronauts.
Blue is the color of a "bluebird".
Meaning of blue.
Blue is often associated with depth and stability. It symbolizes trust, loyalty, wisdom, confidence, intelligence, faith, truth, and heaven.
Blue is considered beneficial to the mind and body. It slows human metabolism and produces a calming effect. Blue is strongly associated with tranquility and calmness. In heraldry, blue is used to symbolize piety and sincerity.
Blue is a masculine color; according to studies, it is highly accepted among males. Dark blue is associated with depth, expertise, and stability; it is a preferred color for corporate America.
Light blue is associated with health, healing, tranquility, understanding, and softness.
Dark blue represents knowledge, power, integrity, and seriousness.

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