The body of light, sometimes called the 'astral body' or the 'subtle body,' is a "quasi material" aspect of the human body, being neither solely physical nor solely spiritual, posited by a number of philosophers, and elaborated on according to various esoteric, occult, and mystical teachings. Other terms used for this body include body of glory, spirit-body, radiant body, luciform body, augoeides ('radiant'), astroeides ('starry or sidereal body'), and celestial body. The concept derives from the philosophy of Plato: the word 'astral' means 'of the stars'; thus the astral plane consists of the Seven Heavens of the classical planets. The idea is rooted in common worldwide religious accounts of the afterlife in which the soul's journey or "ascent" is described in such terms as "an ecstatic, mystical or out-of body experience, wherein the spiritual traveller leaves the physical body and travels in their body of light into 'higher' realms." Neoplatonists Porphyry and Proclus elaborated on Plato's description of the starry nature of the human psyche. Throughout the Renaissance, philosophers and alchemists, healers including Paracelsus and his students, and natural scientists such as John Dee, continued to discuss the nature of the astral world intermediate between earth and the divine. The concept of the astral body or body of light was adopted by 19th-century ceremonial magician Éliphas Lévi, Florence Farr and the magicians of the Hermetic Order of the Golden Dawn, including Aleister Crowley. History Plato and Aristotle taught that the stars were composed of a type of matter different from the four earthly elements - a fifth, ethereal element or quintessence. In the astral mysticism of the classical world the human psyche was composed of the same material, thus accounting for the influence of the stars upon human affairs. In his commentaries on Plato's Timaeus, Proclus wrote; Such doctrines were commonplace in mystery-schools, Gnostic and Hermetic sects throughout the Roman Empire, and influenced the early Christian church. Paul's Second Epistle to the Corinthians contains a reference to the astral plane or astral projection: "I know a man in Christ who fourteen years ago was caught up to the third heaven. Whether it was in the body or out of the body I do not know—God knows." Neoplatonism Neoplatonism is a branch of classical philosophy that uses the works of Plato as a guide to understanding religion and the world. In the Myth of Er, particularly, Plato rendered an account of