#visual_hallucination  illusory visual perception
  supertype:  #hallucination  illusory perception; a common symptom of severe mental disorder
  subtype:  #chromatism.visual_hallucination  hallucinatory perception of colored lights
  subtype:  #pink_elephants  any visual hallucination arising from heavy drinking
  subtype:  #zoopsia  visual hallucination of animals; sometimes occurring in delirium tremens

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