Summary
These diagrams illustrate the evolution of the aspect ratio of the 35mm film from the silent era through Academy, Flat, Cinemascope and Widescreen formats, with additional examples of post-WWII cinema in Europe, Asia and the former USSR.
Body
While this diagram and its use of the word "present" may seem "dated" or "frozen in time" the historic information herein can provide valuable context for students, faculty and technicians who specialize in early and latter day audiovisual technology.