Tibetan Buddhists have thought a lot about light and color.
Here is a Green Tara in the center (Samaya Tara Yogini), with blue, red, white, and yellow Taras in the corners.
What does it all mean?
Your homework for the weekend.
A skeleton key to colors:
Blue represents purity and healing. Associated with Air. When meditating on this color, anger can be transformed into wisdom.
White is the color of learning and knowledge. Associated with Water. When meditating on this color, one can overcome delusions and ignorance and gain access to the wisdom of reality.
Red is related to life force and preservation. Associated with Fire. Meditating on the color red transforms the delusions of attachment into the wisdom of discernment.
Green is the color of balance and harmony. Associated with Nature. Meditation on the color green can help to transform jealousy into the wisdom of accomplishment.
Yellow symbolizes rootedness and renunciation. Associated with Earth. Meditation on yellow can transform pride into the wisdom of sameness and unity.