In parapsychology and spiritual practice, an aura is a supposed 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.