To put this into simple English: (1) For a long time, science, psychologists, and even most parapsychologists held that nothing could leave the body -- and so whatever occurred as claimed out-of-body must be explainable via some internal psycho-mental mechanisms. It was for this reason that Dr. Osis had been given a very hard time regarding his OOB experiments -- since they were UNSCIENTIFIC within the prevailing science wisdom. (2) Dr. Silfen had designed a very simple experimental set-up via which lines of perceptual sight could be measured as extending from a certain "point" which could be precisely located by the measurements. This simple experiment COULD HAVE BEEN done fifty years earlier, but no one had bothered to do so. Silfen’s experiment gave evidence that "something" did leave the body and organize its perceptual self at a particular point of reference to the target. That "something" also moved its point of reference from window 1 to window 2. NOW. Something additional must be explained. Back in 1972, the out-of-body experience DID NOT have the currency it was to have in later years, especially regarding death-bed and clinical death experiencing. Dr. Osis had been the first exponent within parapsychology to study it in depth, first fully reporting his research in his 1961 book DEATHBED OBSERVATIONS BY PHYSICIANS AND NURSES.