Blue (blu:) is located between violet and green on the optical spectrum.
A blue note is a musical note, sung or played at a slightly lower pitch than the major scale for expressive purposes, giving it a slightly melancholy sound. It is frequently used in jazz and the blues.
In Zen Buddhism, blue is associated with purity and healing. Ears are the body part that is represented by the color blue. Air is the element that accompanies this color. It is believed, when meditating on this color, anger can be transformed into wisdom. Wearing the stone is thought to give the wearer long life, and it is believed to absorb sin. Simultaneously, it embodies the duality of living and dying.
