1. The spirit who acts as a kind of manager through which other spirits communicate to the medium during a séance.
2. In science (and in the scientific investigation of the paranormal—parapsychology), experimental proceedures instituted to prevent extraneous factors from influencing the results of an experiment.
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Tarot Journal and Coloring Book, by Jake Baddeley (Book Cover Design)
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A Psychic's Handbook, by Michelle...
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