[actionfromafar]

I can't find a reference now, but there was some kind of military radar control system, which painted real-time light on film, which was continuously developed and projected on large projectors. It wasn't exactly video, but vector graphics, updated with a new frame every few seconds if I recall. A really wondrous system, with a built in permanent record of what had been shown on screen. (I wonder if these projectors were the inspiration for the projectors in War Games.)