Reading a book now, Inward Journeys to Outer Space (by Rick Strassman,MD, et. al.) that came up with a few fascinating ideas. The first - that the powerful hallucinogen DMT is found in most (if not all) animals, including humans. DMT has no use-resistance either, its effects not diminished by constant exposure. DMT is one of the few drugs that is readily transported across the blood-brain barrier directly into the brain, and it is also possible that the pineal gland creates it and/or is receptive to it. The pineal gland has long been understood as a "gateway" inner eye that allows humans to have contact with higher gods, dimensions, or heavens (however it is put). Descartes himself remarked on it as such. It is situated in the center of the frontal lobe, almost exactly where the Eastern religions posit the spiritual third eye.
Thus is the background. What Strassman conjectures is this: that it is possible that endogenous (natural) DMT directly affects how we experience reality - that its continual release and use at a specific dose creates the reality we perceive. By supplying additional amounts artificially, he speculates that the visions we see and the realities that we then experience are no less valid than ordinary, but rather are simply other levels whose experience is made possible by higher doses of DMT. That is, that we live in a reality that is instantaneously multi-faceted and multi-dimensional. This leads to speculation # 2:
That the realities experienced under high levels of DMT are just as real as this one, which would make knowledge gained from their experience genuine and usable. Strassman even proposes that such knowledge might help solve the many problems we are encountering in our present era of this reality.
In my book (so far unpublished) Remission, I gave to one of my characters the ability to move about the "many worlds" exactly to experience and collect knowledge from other worlds. It was my thesis that not all knowledge from one world was applicable to this, but that some was; and that such knowledge, through practice, could be "wheedled through" the reality barrier back into ours. In this way, fetes of apparent magic or miracles could be had, as our protagonist demonstrates in the book again and again.
And there it was, this same idea, taken from scientific observation as something that one day might be proven true even by our dull, flat, ordinary means of testing. Who knew? Then again, who knows where many ideas come from?
I think they come from different reality spectrums that are available beyond our immediate perceptions and thoughts - whole realities available at the slightest twitch of chemistry, or the slightest wriggling of the mind. FK