In parapsychology and spiritual practice, an aura is a field of subtle, luminous radiation surrounding a person or object like the halo or aureola in religious art. The depiction of such an aura often connotes a person of particular power or holiness. It is said that all objects and all living things manifest such an aura. Often it is held to be perceptible, whether spontaneously or with practice: such perception is at times linked with the third eye of Indian spirituality. Various writers associate various personality traits with the colors of different layers of the aura. It has also been described as a map of the thoughts and feelings surrounding a person.
Skeptics such as Robert Todd Carroll contend that people may perceive auras because of effects within the brain: synesthesia,epilepsy, migraines, or the influence of psychedelic drugs such as LSD. Other causes may include disorders within the visual system provoking optical effects. Eye fatigue can also produce an aura, sometimes referred to as eye burn.
Attempts to prove the existence of auras scientifically have repeatedly met with failure; for example people are unable to see auras in the dark, and auras have never been successfully used to identify people when their identifying features are otherwise obscured in controlled tests.
In Iran the aura is known as farr or "glory": it is depicted in association with Zoroastrian kings.
Ideas of the aura are well represented in Indian religions. In tantric tradition of Hinduism, aura represents the subtle body of seven colours. In many Hindu paintings of gods and goddesses, aura is marked on their backhead. The Buddhist flag represents the colours seen around the enlightened Buddha. In Jainism the concept of Lesya relates colours to mental and emotional dispositions. To the Indian teacher Meher Baba the aura is of seven colours, associated with the subtle body and its store of mental and emotional impressions. Spiritual practice gradually transforms this aura into a spiritual halo.Hindu and Buddhist sources often link these colours to Kundalini energy and the chakras.