Speculations on Psychedelic Mushrooms, the Amazon, Virtual Reality, UFOs, Evolution | Paperback Body, Mind & Spirit / Entheogens & Visionary Substances Cited by the L.A. Weekly as "the culture's foremost spokesman for the psychedelic experience," Terrence McKenna is an underground legend as a brilliant raconteur, adventurer, and expert on the experiential use of mind-altering plants. In these essays, interviews, and narrative adventures, McKenna takes us on a mesmerizing journey deep into the Amazon as well as into the hidden recesses of the human psyche and the outer limits of our culture, giving us startling visions of the past and future.