In "The Ontology of the Photographic Image", André Bazin introduces a number of different metaphors for understanding what a photographic image is like:
3. terra cotta statuette of a dead person
4. arrow-pierced clay bear
5. oil portrait of royalty
8. Holy Shroud of Turin
12. hallucination that is also a fact
13. insect trapped in amber
At the very least, you've got to give him props for coming up with so many different metaphors in a nine page essay.