"The rational soul..akin to the great Soul of the World" while "the material universe, like the body, is made as a faded image of the Intelligible".
Each succeeding plane of manifestation is causal to the next, a world-view called emanationism; "from the One proceeds Intellect, from Intellect Soul, and from Soul - in its lower phase, or that of Nature - the material universe".
It’s important to know that astral projection is safe, and that when using this guided hypnosis, it’s a comfortable, exciting experience.
During an out-of-body experience, you can explore higher astral planes and travel places you’ve never even imagined.
Then almost as soon as you've laid down, you find yourself flying through the air until you feel like you're falling, and your body JERKS you awake, although you can't be sure you were completely asleep in the first place.
According to classical, medieval and renaissance Hermeticism, Neoplatonism, and later Theosophist and Rosicrucian thought the astral body is an intermediate body of light linking the rational soul to the physical body while the astral plane is an intermediate world of light between Heaven and Earth, composed of the spheres of the planets and stars.
These astral spheres were held to be populated by angels, demons and spirits.
This is actually a skill you can practice in much the same way as riding a bike, but if you're having trouble understanding why you'd want to practice a skill like this, astral intimacy might provide some insight.
To be blunt, it's astral, out-of-body sex with another soul.