“Whether you experience heaven or hell, remember that it is your mind which creates them.” Six years before Timothy Leary wrote these words in his seminal 1966 text, The Psychedelic Experience: A Manual Based on the Tibetan Book of the Dead, Brion Gysin quite literally saw the light. On a bus journey to Marseille, the British-Canadian artist-inventor had an encounter that could be described as a pretty textbook psychedelic experience — one without the aid of psychotropic drugs, foundational Tibetan guides or anything in between. As the setting sun cut through rapidly-passing trees, Gysin shut his eyes before observing what he called “a…