By the way, reconsidering this story,‘making the girl see her mother = killing the girl( the physical body of the girl )’implies that her real parent departed this world namely died already.
In a word, the old man hypnotizing the girl is her foster parent.
※ This may be a kind of hypnotic education frequently carried out through various media even on the earth.
Some point out that the essence of education actually has affinity with various ways of mind-control or brainwashing including hypnotism.
In the sense,‘trans-parent’rather than transparent implicates the switch of real parent with foster( virtual or substantial ) parent.
※ In wide sense, an educator such as a teacher also can be regarded as a foster parent.
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We re-membered that conjugate continuous geomagnetic pulsations between some location of the Quebec-province of Canada and some spot of the Antarctica were particularly remarkable on about the summer solstice in 1964 from the term for production of this story.
It's known that a geomagnetic field has a feature as a recording medium like a magnetic tape.