using what is known in some forms of philosophical or religious thought as the astral body—a second body said to belong to each individual, formed of a substance which is above or beyond perception by the senses and which pervades all space. Per these beliefs, the astral body accompanies the individual through life, is able to leave the human body at will, and survives the individual afterdeath. Astral bodies are actually just somebody's delusion. They are usually mock-ups which the mystic then tries to believe real. He sees the astral body as something else and then seeks to inhabit it in the most common practices of "astral walking." —Dianetics 55! Glossary (app 9.7.90)