A Different Kind of Ghost?

This is the true story of my dad’s experience of a very different kind of ghost.
I am sure that there are different types of ghost; going from the accounts of people’s experiences, there seem to be ghosts of people, animals and inanimate objects which appear to be just shadows or reflections of something or someone who was once there. There is normally no apparent reason for them to appear. Perhaps they are something like a mirage? Or “time-slip”? (I am thinking of the famous case of the Edwardian ladies who found themselves spectators in the 18th-century for a time during a visit to the palace of Versailles.) There are also similar phantoms from the past, but this time with perhaps a reason for their appearance, such as strong emotions or a tragedy. They are often said to appear on the anniversary of a particular event but, like the other sort,

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