The study of eidolons, phantoms, or ghost-like phenomena; a pseudo-scientific discipline concerned with apparitions and spectral forms.
From 'eidolon' (phantom) plus '-ology' (study of), a 19th-century coinage describing the systematic study of paranormal or ghostly phenomena.
Eidolology was a serious (if mistaken) 1800s field where researchers tried to document and classify phantom sightings scientifically—it's an ancestor of modern paranormal investigation, showing how belief systems create entire pseudo-sciences.
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