A magical or mystical mirror or instrument supposedly used to view celestial visions or divine images in occult and paranormal practices.
From Greek 'eidos' (image) and 'ouranos' (heaven/sky), literally 'heavenly image,' a term coined in occult literature to describe purported scrying devices or celestial viewing instruments.
An eidouranion belongs to the tradition of 'scrying mirrors' and 'crystal balls'—tools that magicians claimed could reveal divine visions, when really they worked through the observer's own imagination and pattern-recognition instincts.
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