Aura is a term for the energy field believed to surround all living things. It is the focus of several healing arts, including polarity therapy, cranial sacral technique, and Reiki. An aura is believed to be produced by the energy generated by a living organism, and as such is presumed to be electromagnetic in nature. The existence of auras has never been conclusively proven by any scientific testing, and the scientific community at large tends to maintain that auras are a nonexistent, paranormal phenomena.