An apparition of a dead person is also called a ghost . Since the late nineteenth century there have been many studies of the phenomena, but conclusive proof of the existence of apparitions remains elusive. Reported experiences of apparitions usually involve strange smells, extreme cold and the displacement of objects.
Some apparitions appear corporeal, others luminous or transparent.
Ghosts are often clothed in period costume. Most apparitions appear for a specific reason, such as to deliver a warning, or to offer comfort for grieving relatives, or to impart essential information. English Ghosts . Ghost Stories . Secrets of the Unknown - Hollywood Haunting .