Manipulating light can induce psychedelic experiences – and scientists aren't quite sure why
For millennia, people have used mind-altering techniques to achieve different states of consciousness, envision spiritual figures, connect with nature, or simply for the fun of it. Psychedelic substances, in particular, have a long and controversial history. But for just as long, people have been having these experiences without drugs too, using rhythmic techniques such as rocking, chanting or drumming.
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