Hallucinations usually appear as illusory objects on the normal background of reality, but an interesting case report in the medical journal Movement Disorders reports a case of someone who hallucinated background scenery on which real people were superimposed.
We describe a patient with PD [Parkinson's disease], who had unusual background scenery VHs [visual hallucinations] on which a true person was superimposed…
In December 2008, when her husband died, she experienced background scenery VHs appearing in the left upper part of her visual fields. The abnormal scenery often became larger to encompass the full visual fields and always comprised the countryside where she was born and grew up….
In July 2009, she spoke to her deceased husband in the medical examination room, and she experienced a background scenery VHs during the examination. A physician requested her to draw the VH, and she drew a countryside scene, appearing sad. When asked how a physician in front of her was reflected in her visual field, she replied that the physician appeared normal but beside a river in the midst of the VH.
Link to PubMed entry for brief case report.