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In page Crystal gazing:

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The psychologist Millais Culpin wrote that crystal gazing allows a form of self-hypnosis with fantasies and memories from the unconscious of the subject appearing as visions in the crystal.[5] Analysis of the content suggest they are a kind of hallucination that visualizes things in memory or of expectations, for example a subject who was told to expect to see soldiers, saw exactly this when gazing in a crystall ball. The subject had previously experienced hallucinations when looking at reflective surfaces, something which tends to be true of most people who experience visions when gazing at crystals.[6]