I remember an assembly at school that consisted of a multi-image presentation called Eye to Eye. In terms of content I think it fell into the typical early 90s

I remember an assembly at school that consisted of a multi-image presentation called Eye to Eye. In terms of content I think it fell into the typical early 90s don't-do-school, stay-in-drugs messaging of the time, but I was fascinated by it because it was driven by nine computer-controlled, precisely timed slide projectors arranged in a 3x3 square with accompanying audio playback; and supplemented by a 16mm film projector that occasionally replaced the center slide projector and provided "video" in the center of the square surrounded by images from the other eight projectors. By switching slides on a "rolling" schedule, the slide projectors could achieve very smooth fades and transitions. Combined with the accompanying audio, it made for an effect that was almost movie-like, showing characters moving and speaking more smoothly than you would expect a slideshow to be capable of. The humble slide projector is far more capable than one might guess, and has played a central role in all manner of visual presentation: the infamous "Big Board" from the gameshow Press Your Luck, for instance, consisted of slide projectors showing the various cash amounts, prizes, Whammies, etc. onto screens around the perimeter of the board, while border lights around each screen turned on to highlight which one the player would win if they hit the stop button. Famously, this arrangement was not random and super exploitable. Now of course, the slide projector has joined the rotary phone and the floppy disk on the scrap heap of once-ubiquitous technologies that vanished after their moment passed.