Encyclopedia of Fantasy (1997)
Hallucination

The Perception (in fantasy usually visual, though other senses may be invoked) of an object which does not exist or the experience of a false sensation. In Supernatural Fiction and Horror, plots commonly turn on whether a hallucination is not in fact a hallucination at all but has been created by some intruder into the real world. The structure of fantasy stories does not normally depend on the correct interpretation of hallucination, Illusion being much more common. [JC]

This entry is taken from the Encyclopedia of Fantasy (1997) edited by John Clute and John Grant. It is provided as a reference and resource for users of the SF Encyclopedia, but apart from possible small corrections has not been updated.