Interesting take. But what it reminded me of was the method of showing multi-reel movies, using multiple projectors. As a reel is nearing the end, the projectionist would watch the upper right corner of the screen for a small circle to flash for just a frame or two. On the second flash, in one motion, the projectionist would stop one projector, and start a second projector loaded with the next reel. While that reel was being shown, he would load the third reel on the first projector, and so on. If it was done correctly, the changeover was undetectable by the audience.
This method of projection was used until the 1970s or 80s, when platter systems started to proliferate. This also marked the end of the professional projectionist, as the platter system was essentially self-running, once the film reels had been properly spliced and threaded through the system. The downside was that, because of the complex path the film traveled, a break in the film could take a good deal of time to fix.
