Seeing something that isn’t present in the surrounding environment.
Example: The patient stares fixedly at a blank wall, and his face shows a shifting emotional response as though he’s watching a film. Later, he asks whether anyone else enjoyed the “projector show”.
Grinnell, R. (2011). Visual Hallucination. Psych Central. Retrieved on April 29, 2016, from http://psychcentral.com/encyclopedia/visual-hallucination/