In Tibetan Buddhism, it is said that certain meditation practices can alter the appearance of the body, transforming it into five radiant lights. The name given to this physical fluorescence is "rainbow body."
In Vajrayana traditions of Tibetan Buddhism, tangible matter is considered to be made up of five elements: space, air, fire, water, and earth. As described in Tibetan literary sources, including The Tibetan Book of the Dead, the elemental energies that make up the cosmos are understood to be undifferentiated from those that make up the human body. Therefore, the body is simultaneously an individual person and the cosmic whole.
Certain Buddhist meditation practices are meant to alter the gravitational field of these five elements that constitute the body, transforming them into the five radiant lights of the color spectrum. The Tibetan name given to this physical fluorescence is jalu, literally meaning, "rainbow body." Rainbow body is also the name given to the transformation of the ordinary physical body as a result of years of specific disciplined practices.
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