Gordon Rutter. Ghosts Caught on Film 3: Photographs of the Supernatural. David and Charles, 2011.
In his book Apparitions published in 1953, the then influential psychical research G. N. M. Tyrrell produced a list of the properties of what he considered to be the perfect apparition. One of these was that apparitions could not be photographed, for the simple reason that they were not physical objects present in the environment, but hallucinations, or as we might say today virtual experiences.
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