Interesting, that makes sense as a way to depict individual numerals. But even at film/screen framerates, isn’t the basic motion picture idea that you’d get an illusion of continuity? The digits would flicker but the overall effect would still be something of a blur?

I have to imagine that, as his 20,000fps-or-whatever example demonstrates, you’d run into exposure challenges at speeds fast enough to capture individual digits on this particular clock