 The study and discussion of apparitions developed in a different direction in the 1970s, with the work of Celia Green and Charles McCreery.They were not primarily interested in the question of whether apparitions could shed any light on the existence or otherwise of telepathy, or in the survival question; instead they were concerned to analyse a large number of cases with a view to providing a taxonomy of the different types of experience, viewed simply as a type of anomalous perceptual experience or hallucination.One of the points that was highlighted by their work was point (2) listed above, namely that ‘real-life’ accounts of apparitional experiences differ markedly from the traditional or literary ghost story.