Sorry, I digress...
Apropos of nothing but microfilm, in the late 1990's, I had the tedious task of using a Hazeline Analog Color Video Film Analyzer to establish exposure for copying the entire microfilm copy of the Urga Tanjur, originally kept in Ulaanbaatar, which was shot on Svema (Soviet) microfilm in the 1950's.
Being that the frames were in 4 perf height motion picture format, not the typical 8 perf horizontal Leica standard, it was determined that the camera was probably a motion picture camera with a single frame hand crank used to copy the pages of this huge, hand crafted document.
Over 100,000 frames of pages, but I could only change printing lights every 4 frames, due to limitations on light valves in the motion picture printers. Took over 3 weeks to analyze and it was boring at first when the novelty of the situation wore-off.
However, about a week into the process, I realized the cover glass used to flatten this most rare of all Mongolian Tanjurs (Buddhist Texts) reflected the sunlight of the exterior valley through the temple pillars and revealed glimpses of monks looking over the shoulder of the person copying the texts. From this information I was able to see a time lapse of each day the person worked and the ebb and flow of the monks and people, as well as the person copying the texts; a dour looking man with straggly black hair.
If I sped through the reels (which had been joined end to end in frame for printing convenience) and watched the monitor intently , I got to watch about 3 months of ebb and flow of life around the temple as the Sun sped across the sky. The earlier parts of the book were often crowded with onlookers, but by the time of the last pages, it was only the dour man and a few kids and a old men who hung around to see what was happening.
I think about this occasionally; how I looked back through an unwanted reflection produced in copying a document and somehow connected with a few of those long Asiatic faces staring intently at the cover glass as if watching some portal through time.
The copies I generated now reside in the Mongolian Collection of the Asian Reading Room of the Library of Congress, valued strictly for their ultra rare content, literally valued for the words scribed on the page.
Little do they know, that when you speed the pages through a viewer, three months of life in 1950's Ulaanbaatar jump to life and faintly skitter around the screen, jumping in and out of focus and sight as the sun speeds across the background as the Dour man vibrates and shimmers like a bored God making life...
If you ever go to Washington DC, see if you can talk them into letting you look at this microfilm, DO keep an eye open for reflections.
After a while, you'd swear they see you and maybe wonder who is "real"!
Frank W.