Spirit-tapping
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Spirit tapping is a purported phenomenon which is said to be heard during seance and spiritist invocations supposedly coming from "spirits of the departed", "ascended masters", "spirit guides", "familiar spirits", evil spirits posing as and taking the form of departed loved-ones, et al. as being the proof positive that a spirit is "making contact" with the medium and seekers.
It was the chief type of purported spiritist demonstration in the early XIX century, before psychography was discovered.
Many claimed that it was a spiritual morse code and other various claims or origination. Eye and ear witness accounts of such activities have been reported as has the discovery that many times the sounds were being made under the table by or in the pockets of various "magicians" charlatans and spiritist mediums themselves. The phenomenon has been proven wrong by many scientists who wrote passwords and gave them to people of trust, containing a password that should be spoken by the scientist if he ever tried to make contact, to validate the truth of the claim. This has been done also by people outside of science, like Brazilian writer Monteiro Lobato [1] and magician Houdini.