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Peaceful, tranquil blue causes the body to produce calming chemicals, so it is often used in bedrooms. However, blue can also be cold and depressing. Wearing blue could also symbolize loyalty and people tend to be more productive in blue rooms. Studies show weightlifters are able to handle heavier weights in blue gyms.
Cherokees: Defeat, trouble
Iran: Colour of heaven and spirituality
Western: Depression, sadness, conservative, corporate