Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Visual and Verbal Communication (hierarchy name)
4. Visual Works (hierarchy name)
5. visual works (works)
6. [visual works by material or technique]
7. photographs
8. [photographs by form]
9. [photographs by form: format]

Anotations

Scope note:

Transparent positive images made or mounted on glass for projection, usually but not necessarily photographic, measuring 3 1/4 to 3 1/2 by 4 inches for projection onto a screen by means of a specialized projector.