I quoted your paragraph,
Once on the Astral plane a whole new set of challenges and experiences await you. This is where physical reality has its roots and you may see glimpses of potential futures, meet beings that are particular to this aspect of reality, and see the workings of the multiverse itself. Hopefully this is where the experiences with lucid dreaming will pay off, as all the beings and events you have experienced in that state are part of your own personality. If you have been interpreting your dreams then the symbolism you encounter should tell you if what you encounter is an external being or a projected part of your own persona. At this level of being your Pagan practice and rituals are truly integrated into the Universe and have powerful effects.
You know I was just reading something I think it was Plato? He mentions what "men" see today is but a shadow of reality. If it's not him, it's someone close. I'll have to double check. I have books all over the place.
But that one line is about right. I've been "Over There" for lack of better word, but the thing is, we're all half there, half here and when you dream, there's just no telling the infinite amount of information that comes through from all over the place.
If someone were to ask me. I'd say, here is more of an illusion than there. But it's here we create within the means available in a Spiritual/physical world.
I had to have a crazy dream last night...