yes, I understand that. But I want to concrete piice of evidence, which I can display to a third party: This is a Ghost. So, for that to happen, they should be quantifiable. A part of the natural realm.
I believe if a spirit is defined as being the essence of a human being, then it by default is a part of the natural realm. None of this should be defined as supernatural. We just may lack the method of detection, or of consistant, reproducable detection.
The same with ghosts, if they are real. Visions, which are part of the human condition, that is, internally interpreted manifestations of the mind (falling in the same category as dreams?) may not be real, as in concrete.
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