#hallucination  illusory perception; a common symptom of severe mental disorder
  supertype:  psychotic_belief__psychoticbelief__delusion  an erroneous belief that is held in the face of evidence to the contrary
  subtype:  auditory_hallucination__acousma  illusory auditory perception of strange nonverbal sounds
  subtype:  pseudohallucination  an image vivid enough to be a hallucination but recognized as unreal
  subtype:  trip.hallucination  a hallucinatory experience induced by drugs; "an acid trip"
  subtype:  visual_hallucination  illusory visual perception
     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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