The color blue represents depression and sadness. It can represent tranquility, relaxation, and peace. People relax more around blue.

Colours such as blue and green are often used in places like doctor or dentist surgeries, because blue has been found to have a much more calming effect on patients than other colours.

Blue is the colour of a sky with little or very few clouds, which may explain why it has a soothing effect on people, as opposed to grey, the colour of a stormy sky.

Blue is also associated with the fifth chakra, located at the throat. It is therefore connected to communication. Someone who speaks the truth and is faithful in all ways is "true blue." When communication is lacking, we can talk to someone until we are "blue in the face."

The color of ocean and sky, blue represents mystery, depth, and intuition. When something profoundly surprises us, it comes "out of the blue."

Blue is frequently associated with emotions. Having the "blues" denotes a dip in our feelings.

In Iran, blue is a symbol of immortality.

Christian art often assigns the color blue to the Virgin Mary, both as a symbol of her perpetual virginity and purity and her connection with the Divine. Most Roman Catholic Marian orders use blue in the color of their habits or coats-of-arms.

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