Positive transparencies in mounts suitable for projection, usually 35mm film in a mount of 2 by 2 inches. An image on film or glass, usually positive, intended to be viewed by means of light passing through the image and base using a viewer or projector

Photographs having gray, black, and white tones or images with only one hue (sepia)

Drawings/Prints/Computer images of architecture, whether or not the building was constructed