Why does blue represent calmness?

Blue represents calmness largely due to its association with nature, particularly the sky and water, which evoke feelings of serenity and tranquility. Psychologically, the color blue has been shown to lower heart rates and reduce feelings of anxiety, promoting a sense of peace. Additionally, cultural and societal associations with blue often reinforce its calming qualities, making it a popular choice in environments designed for relaxation, such as bedrooms and spas.