A 43-year-old lady is being treated for temporal lobe epilepsy in a Swiss clinic. In order to pinpoint the aberrant electrical focus in her brain, electrodes have been implanted under the dura - the membrane covering the brain. When she is wakened, the doctors stimulate different areas and watch the results. When they activate an area called the angular gyrus on the right side, she reports a feeling of "sinking into the bed". This progresses to "falling from a height". With stronger currents she reports she is "floating two metres above the bed" and actually able to see her own body parts lying below her. She is having an "Out of Body Experience" (OBE), and hers is a classical description. Some 10 per cent of the population endure these sensations at some time. These can be terrifying, though mostly brief. Associated with epilepsy and migraine, they also occur in normal people, often in states of altered consciousness. They seem to be closely linked to "Near Death Experiences" (NDEs), which take place in extremis, due to an interruption in the supply of oxygen to the brain: or occur when under the influence of drugs - opiates, ketamine, LSD and other hallucinogens - or of sensory deprivation, or brain stimulation of the right angular gyrus as described above. One of the most celebrated cases was that of the psychologist, Carl Jung. After a heart attack, heavily doped and unconscious, he saw a huge dark stone in space, a meteorite with an entrance into a chamber, where he met a Hindu. Thinking he was about to be inducted into life’s mysteries, his hopes were dashed by his doctor appearing in the guise of a Greek healer, telling him he was not destined to die yet. Jung survived, much impressed with himself, and his visionary life flowered. His major works were then written and he was hailed and worshipped as a guru, much revered by New Agers in the 1960s and by mainstream thinkers.