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The ideas of invisible components of living things trace back to ancient ideas attempting to describe by scenario the difference between the states of life and death. There are nearly as many versions of these invisible components as there are different cultures on earth.
These are the most common versions
of the life/death scenario. Cultures such as the ancient
Egyptians expanded on these ideas to an incredible degree,
partially by combining several originally completely different
religions into a single one. One simplification of the Egyptian
ideas that has come down to the present day is the Body
Double, or Astral
Body, an immaterial thing that is otherwise
identical to the physical body, and has the same situation,
profession and needs as the real body, after the real body dies.
A classic pseudoscientific spinoff from this scenario is the
claim that "psychics" can do "astral
projection," that is, send their astral body out to
view distant locations and events, as popularized particularly
in late 19th Century Theosophy. This eventually evolved
into the pseudoscience of remote
viewing. Often in human history, two or more nations that
were originally culturally independent have been politically
unified, and their once-separate religions merged. In the case
of ancient Egypt, so many different religions were merged that
at least nine different immaterial, invisible entities were
thought to exist within every individual!
Once the unverifiable concept of a soul had been introduced, an obvious question arose in some cultures. If the soul was immortal, where was it before the individual was born? Was it conceived and born with the individual, or did it get attached to the individual somewhere between conception and birth? And if attached, where did it come from? This led to a scenario in which a soul, when an individual dies, jumps immediately to another individual being born at that same moment! This is the idea of Reincarnation, or Metempsychosis. The latter doctrine is usually attributed to the ancient Greeks, but the former, general concept is mostly found in religions of the Far East. Pseudoscientists of all stripes absolutely love this concept. You can take (expensive) courses to learn to remember your (many) past lives! Scientology has particularly exploited this theme.
"Who would fardels bear, To grunt and sweat under a weary life, But that the dread of something after death, The undiscovered country from whose bourn No traveler returns, puzzles the will And makes us rather bear those ills we have Than fly to others that we know not of?" (Shakespeare, HAMLET, Act 3, Scene 1)
“Since there is no way to tell the difference between a baby with a soul that will go to heaven or hell, a baby with a soul that has been around before in other bodies, and a baby with no soul at all, it follows that the idea of a soul adds nothing to our concept of a human being. Applying Occam's razor, both the idea of reincarnation and the idea of an immortal soul that will go to heaven or hell are equally unnecessary.” [Robert Todd Carroll]
“It seems to me that we are in the
position of a company of players who have by chance found their
way into a great theater. Outside, the city streets are dark and
lifeless, but in the theater the lights are on, the air is warm,
and the walls are wonderfully decorated. However, no scripts are
found, so the players begin to improvise— a little psychological
drama, a little poetry, whatever comes to mind. Some even set
themselves to explain the stage machinery. The players do not
forget that they are just amusing themselves, and that they will
have to return to the darkness outside the theater, but while on
the stage they do their best to give a good performance. I
suppose that this is a rather melancholy view of human life, but
melancholy is one of the distinctive creations of our species,
and not without its own consolations.” [Steven Weinberg,
2001]
The worldwide success of the bestselling Bridey Murphy book triggered a mid-1950s craze which resulted in reincarnation-themed comic books, TV dramas, and many, many low-budget movies, mainly in the horror genre!