#illusion__semblance  an erroneous mental representation
  supertype:  #appearance.internal_representation  a mental representation; "I tried to describe his appearance to the police"
  subtype:  #phantom__apparition__shadow  something existing in perception only: "a ghostly apparition at midnight"
     subtype:  #unidentified_flying_object__UFO__flying_saucer  an (apparently) flying object whose nature is unknown; especially those considered to have extraterrestrial origins
     subtype:  #Flying_Dutchman.phantom__flyingdutchman  a phantom ship that is said to appear in storms near the Cape of Good Hope
     subtype:  #spook__ghost__shade__wraith__specter  a mental representation of some haunting experience; "he looked like he had seen a ghost"; "it aroused specters from his past"
  subtype:  #phantom_limb__phantomlimb  the illusion that a limb still exists after it has been amputated

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