Blue has more complex and contradictory meanings than any other color. These can be easily explained by pinpointing by the specific shade of blue.
Bright blue: cleanliness, strength, dependability, coolness
(The origin of these meanings arise from the qualities of the ocean and inland waters, most of which are more tangible.)
Light (sky) blue: peace, serenity, ethereal, spiritual, infinity
(The origin of these meanings is the intangible aspects of the sky.)
Most blues convey a sense of trust, loyalty, cleanliness, and understanding. On the other hand, blue evolved as symbol of depression in American culture. “Singing the blues” and feeling blue” are good examples of the complexity of color symbolism and how it has been evolved in different cultures.
Blue ranks so high as a favorite color that you can’t go wrong if you use blue. However, blue can be over-used and may wind up a design cliché if used alone. Combining blue with another color creates a more creative effect.
Blue is the only color which maintains its own character in all its tones... it will always stay blue;” Raoul Dufy, French Fauvist Painter, 1877-1953
Blue is sharply refracted by the eyes. This causes the lens to flatten and to push the blue image back. We perceive that blue areas are receding and smaller.
The same refraction causes visual fog if used excessively in interior spaces.
Blue's global similarities are significant:
Blue is the #1 favorite color of all people.
53% of the flags in the world contain blue. Blue is the most commonly used color in corporate identity.
A dark blue suit is professional business attire.
Blue jeans are worn all over the world.