One spring morning in 1953, Aldous Huxley took four-tenths of a gramme of mescalin, sat down and waited for the results. When he opened his eyes, he found everything, from the flowers in a vase to the creases in his trousers, was completely transformed. With breathtaking immediacy he described this new sacramental vision of reality in The Door of Perception. In its sequel, Heaven and Hell, he went on to explore the history and nature of mysticism. Hugely influential, still bristling with a sense of excitement and discovery, these intense and illuminating writings remain the most fascinating accounts of the visionary experience ever written.