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Less risky than Moral Turpitude [wiki], much cheaper than Dr. John Lilly’s Isolation Tank [wiki], Mind Hacks points to an article on hallucinations using the ‘Ganzfeld Procedure’.
This must be a Baby-Boomer’s Must-Do, Revenge Of The Unexplored, A How To Guide to Left Over Ping-Pong Balls Lost in the Rumpus Room [wiki].
Used in parapsychology, also to induce hallucinations, the Ganzfeld procedure creates ‘unstructured sensations’ by placing half ping-pong balls over the eyes to see diffuse white light and by playing white noise through headphones.