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. (2016). Visual Hallucination. Psych Central. Retrieved on September 23, 2017, from https://psychcentral.com/encyclopedia/visual-hallucination/