In Turn of the Screw by Henry James, there is a question of whether the ghosts of Peter Quint and Miss Jessel are real. They seem to only appear to the governess and she is the only one who admits to seeing them. F. W. H. Myers recognized apparitions as "a manifestation of persistent personal energy, --or an indication that some kind of force is being exercised after death which is in some way connected to a person previously known on earth." (P. 141) This fits the story perfectly for the ghosts appear to be nothing, just a "manifestation." The governess swears that Miles and Flora see the ghosts too, but that they refuse to admit it. She sa