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

Architectural drawings or drawings of other subjects, characterized by the depiction of shadows, textures, sometimes colors, often executed with watercolor washes, and showing some setting. Intended as visualizations of the full conception of a project or as an accurate record of the work depicted.