Broca's Brain (51 page)
Authors: Carl Sagan
It is easy for modern astronomers to make fun of the cosmologies of other cultures—for example, the Dogon idea that the universe was hatched from a cosmic egg (
Chapter 6
). But in light of the ideas just presented, I intend to be much more circumspect in my attitudes toward folk cosmologies; their anthropocentrism is just a little bit easier to discern than ours. Might the puzzling Babylonian and Biblical references to waters above and below the firmament, which Thomas Aquinas struggled so painfully to reconcile with Aristotelian physics, be merely an amniotic metaphor? Are we incapable of constructing a cosmology that is not some mathematical encrypting of our own personal origins?
Einstein’s equations of general relativity admit a solution in which the universe expands. But Einstein, inexplicably, overlooked such a solution and opted for an absolutely static, nonevolving cosmos. Is it too much to inquire whether this oversight had perinatal rather than mathematical origins? There is a demonstrated reluctance of physicists and astronomers to accept Big Bang
cosmologies in which the universe expands forever, although conventional Western theologians are more or less delighted with the prospect. Might this dispute, based almost certainly on psychological predispositions, be understood in Grofian terms?
I do not know how close the analogies are between personal perinatal experiences and particular cosmological models. I suppose it is too much to hope that the originators of the Steady State hypothesis were each born by Caesarean section. But the analogies are very close, and the possible connection between psychiatry and cosmology seems very real. Can it really be that every possible mode of origin and evolution of the universe corresponds to a human perinatal experience? Are we such limited creatures that we are unable to construct a cosmology that differs significantly from one of the perinatal stages?
*
Is our ability to know the universe hopelessly ensnared and enmired in the experiences of birth and infancy? Are we doomed to recapitulate our origins in a pretense of understanding the universe? Or might the emerging observational evidence gradually force us into an accommodation with and an understanding of that vast and awesome universe in which we float, lost and brave and questing?
It is customary in the world’s religions to describe Earth as our mother and the sky as our father. This is true of Uranus and Gaea in Greek mythology, and also among Native Americans, Africans, Polynesians, indeed most of the peoples of the planet Earth. However, the very point of the perinatal experience is that we leave our mothers. We do it first at birth and then again
when we set out into the world by ourselves. As painful as those leave-takings are, they are essential for the continuance of the human species. Might this fact have some bearing on the almost mystical appeal that space flight has, at least for many of us? Is it not a leaving of Mother Earth, the world of our origins, to seek our fortune among the stars? This is precisely the final visual metaphor of the film
2001: A Space Odyssey.
Konstantin Tsiolkovsky was a Russian schoolmaster, almost entirely self-educated, who, around the turn of the century, formulated many of the theoretical steps that have since been taken in the development of rocket propulsion and space flight. Tsiolkovsky wrote: “The Earth is the cradle of mankind. But one does not live in the cradle forever.”
We are set irrevocably, I believe, on a path that will take us to the stars—unless in some monstrous capitulation to stupidity and greed, we destroy ourselves first. And out there in the depths of space, it seems very likely that, sooner or later, we will find other intelligent beings. Some of them will be less advanced than we; some, probably most, will be more. Will all the space-faring beings, I wonder, be creatures whose births are painful? The beings more advanced than we will have capabilities far beyond our understanding. In some very real sense they will appear to us as godlike. There will be a great deal of growing up required of the infant human species. Perhaps our descendants in those remote times will look back on us, on the long and wandering journey the human race will have taken from its dimly remembered origins on the distant planet Earth, and recollect our personal and collective histories, our romance with science and religion, with clarity and understanding and love.
*
It is interesting to wonder why psychedelic molecules exist—especially in great abundance—in a variety of plants. The psychedelics are unlikely to provide any immediate benefit for the plant. The hemp plant probably does not get high from its complement of
1
Δ tetrahydrocannabinol. But human beings
cultivate
hemp because the hallucinogenic properties of marijuana are widely prized. There is evidence that in some cultures psychedelic plants are the only domesticated vegetation. It is possible that in such ethnobotany a symbiotic relationship has developed between the plants and the humans. Those plants which by accident provide desired psychedelics are preferentially cultivated. Such artificial selection can exert an extremely powerful influence on subsequent evolution in relatively short time periods—say, tens of thousands of years—as is apparent by comparing many domesticated animals with their wild forebears. Recent work also makes it likely that psychedelic substances work because they are close chemical congeners of natural substances, produced by the brain, which inhibit or enhance neural transmission, and which may have among their physiological functions the induction of endogenous changes in perception or mood.
*
A fascinating description of Grof’s work and the entire range of psychedelics can be found in the forthcoming book
Psychedelic Drugs Reconsidered
by Lester Grinspoon and James Bakalar (New York, Basic Books, 1979). Grof’s own description of his findings can be found in
Realms of the Human Unconscious
by S. Grof (New York, E. P. Dutton, 1976) and
The Human Encounter with Death
by S. Grof and J. Halifax (New York, E. P. Dutton, 1977).
*
Astonishingly, oxytocin turns out to be an ergot derivative that is chemically related to psychedelics such as LSD. Since it induces labor, it is at least a plausible hypothesis that some similar natural substance is employed by nature to induce uterine contractions. But this would imply some fundamental connection for the mother—and perhaps for the child—between birth and psychedelic drugs. Perhaps it is therefore not so implausible that, much later in life under the influence of a psychedelic drug, we recall the birth experience—the event during which we first experienced psychedelic drugs.
*
A different but not inconsistent hypothesis on the Eden metaphor, in phylogeny rather than ontogeny, is described in
The Dragons of Eden.
*
One curious variant is given in Arthur Schnitzler’s
Flight Into Darkness:
“… at all the moments of death of any nature, one lives over again his past life with a rapidity inconceivable to others. This remembered life must also have a last moment, and this last moment its own last moment, and so on, and hence, dying is itself eternity, and hence, in accordance with the theory of limits, one may approach death but can never reach it.” In fact, the sum of an infinite series of this sort is finite, and the argument fails for mathematical as well as other reasons. But it is a useful reminder that we are often willing to accept desperate measures to avoid a serious confrontation with the inevitability of death.
*
Kangaroos are born when they are little more than embryos and must then make, entirely unassisted, a heroic journey hand over hand from birth canal to pouch. Many fail this demanding test. Those who succeed find themselves once again in a warm, dark and protective environment, this one equipped with teats. Would the religion of a species of intelligent marsupials invoke a stern and implacable god who severely tests marsupialkind? Would marsupial cosmology deduce a brief interlude of radiation in a premature Big Bang followed by a “Second Dark,” and then a much more placid emergence into the universe we know?
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