Early on I began to perceive that the effects of the drug respond strikingly to my own subjective determination. If, in response to the swelling intensity of the whole experience, I began to tense up with anxiety, the whole scene appears to tighten in some way. But if I then consciously remind myself to relax, to let myself go into the experience, the effect is dramatic. The space in which I seem to find myself, already enormous, suddenly yawns open even further and the shapes that undulate before my eyes appear to explode with new and even more extravagant patterns. Over and over again I had
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