Michael Talbot and David Bohm (in quotes) in Talbot's The Holographic Universe, Chapter 2: The Cosmos as Hologram, p.51 According to our current understanding of physics, every region of space is awash with different kinds of fields composed of waves of varying lengths. Each wave always has at least some energy. When physicists calculate the minimum amount of energy a wave can possess, they find that every cubic centimeter of empty space contains more energy than the total energy of all the matter in the known universe!
Space is not empty. It is full, a plenum as opposed to a vacuum, and is the ground for the existence of everything, including ourselves. The universe is not separate from this cosmic sea of energy, it is a ripple on its surface, a comparatively small "pattern of excitation" in the midst of an unimaginably vast ocean. "This excitation pattern is relatively autonomous and gives rise to approximately recurrent, stable and separable projections into a three-dimensional explicate order of manifestation," states Bohm. In other words, despite its apparent materiality and enormous size, the universe does not exist in and of itself, but is the stepchild of something far vaster and more ineffable. More than that, it is not even a major production of this vaster something, but is only a passing shadow, a mere hiccup in the greater scheme of things.
From Chapter 21: Open Ending of the audio version of True Hallucinations by Terence McKenna
Jung wrote, "Though we know from experience that psychic processes are related to material ones, we are not in a position to say in what this relationship consists, or how it is possible at all. Precisely because the psyche and the physical are mutually dependent it has often been conjectured that they may be identical somewhere beyond our present experience." Of what does this relationship consist? My own hunch, and it is only a hunch, is that an explicitly spatial dimension - of a co-dimension inclusive of our continuum - allows a hologram of other realized forms of organization, far distant, to become visible at certain levels of quantum resonance in the synaptic field. These levels have been damped by selection in favor of more directly relevant lines of information relating to animal survival. Evolution does not reinforce selectively the ability of an organism to perceive at a distance since such an ability has no selective advantage, unless the information it conveys falls upon the receptors of an organism already sophisicated enough in its use of symbols to abstract concepts for later application.
Thus, these quantum resonances carrying intimations of events at a distance only begin to acquire genetic reinforcement once a species has already achieved sufficient sophistication to be called conscious and mind-possessing. The use of hallucinogens can be seen as an attempt at medical engineering which amplifies, for inspection by consciousness, the quantum resonance of the other parts of the spatial continuum holographically at hand. This experience is the vision which the UFOs and psilocybin impart: visions of strange planets, life forms, perspectives and societies, machines, ruins, landscapes. The hierophanies all unfold in a "nunc-stans" that has all space standing in it, like a frozen hologram. Thus, experimentation with hallucinogens by human beings and the rise in endogenously produced hallucinogens as one advances through the primate phylogeny could both be due to a slow focusing on the phenomenon of imagination. Imagination being the deepening involvement of the species with things beheld but not actually existing in the present at hand.
Terence McKenna, Imagination In The Light Of Nature
I've come to what I call the "geometric model of the psychedelic experience." I certainly don't represent it as the end of the intellectual road, but it is a provisional model which is the best I can do at the moment. I think that, and it seems logically compelling to me, that consciousness as ordinarily experienced is a human ability shaped by evolutionary pressure, and since evolutionary threat and harm usually comes at us in three dimensional space, this is where consciousness has been forced ... to concentrate and define itself.
Let me restate it. Because of the possibility of being stepped on by woolly mammoths and eaten by sabre-tooth tigers, the primitive evolving mind of human beings concentrated on nearby space and time because that's where threat comes from, the kind of threat that has to be immediately responded to by running away or fighting or something like that. But ... if the psychedelics prove anything they prove that consciousness is an incredibly plastic and malleable medium. So what happens, when you take a compound like psilocybin in silent darkness, in a situation of no threat and low anxiety and low input from the exterior world is that this function, which is essentially in most situations a closed fist ready to strike out at something coming from nearby, unfolds into something much more beautiful, much more interesting, and much more true to itself. In other words, not defined by an exterior context or situation, but defined by its own mechanics.