The astral body is the vehicle of both unconscious thought and of the emotions and desires, drawing at one and the same time from them. It can be projected from the body to travel through all the worlds beneath Spirit. It is said by many that this body is composed of two elements: the higher and the lower. The higher spiritual elements are an expression of spirit while the lower part, containing the unconsious and emotional elements, is the source of "ghosts" or apparitions of the dead.