The Modern Mechanix blog has a post about a German invention from 1937 that allowed everyone to see the speaker. The hair doesn’t look right, but the mustache almost does. I think that is supposed to be Adolf Hitler up there.
The system scans the speaker with a green light and then uses that to produce an image through a cathode ray tube which goes through a lens and onto a large screen.
So, if you ever have a need of an argument against using I-Mag in some situation (too small of a venue, improper equipment, ugly preacher, etc.) just pull out the argument “Hitler used I-Mag, are we going to start book burning and pogroms as well?”