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Many things that people "see" are really constructions of the brain. This idea got me thinking about ghosts. I personally don't believe in ghosts. However, several people that I know, including my sister and my aunt have "seen" ghosts. I know that they aren't lying; they truly believe they have seen/heard/spoken to ghosts. In my opinion these experiences are constructions of their brains, similar to a hallucination. My question is then can a perfectly healthy individual's brain repetedly construct a very specific event out of nothing? And if so, why?