#phantom__apparition__shadow  something existing in perception only: "a ghostly apparition at midnight"
  supertype:  illusion__semblance  an erroneous mental representation
  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"

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