Analysing necromancy photographs. Manifesting spirits of dead

Analysing necromancy photographs. Manifesting spirit of dead person.
In some weird old photographs from late 1800th and early 1900th it seems like some people had knowledge to manifest and communicate spirits of a dead person. There are many photographs and different types of devices and techniques used in those photos.
In this presentation i try to find common points and connections between these necromancy photos from old world order to figure out how they were able to do necromancy.
I don't own the music.
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