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In The Doors of Perception, Aldous Huxley echoes this: Enforced undereating during the Middle Ages affected collective brain chemistry, and this, Huxley believed, explains the high incidence of visionary experience in those times.
In The Doors of Perception, Aldous Huxley reported that his interest in time fell “almost to zero” when he was under the effects of mescaline.
The Doors named their group from a line of William Blake's poetry: "the doors of perception."