A cathode ray tube TV's light beam captured at 380,117 frames per second

The Slow Mo Guys filmed an old cathode ray tube TV (playing Super Mario Bros.) with an ultra high-speed camera. It struck me that I've always known how CRTs work—the RGB electron beams trained across the screen, line by line, completing a full picture 50 or 60 times a second—but never actually seen the reality of it slowed down. There's something quite haunting about it.

"A CRT can draw Mario's mustache in less than 1/380,000th of a second"

Moving onto a modern 4K TV, you can see not just how much more gets drawn, but how the technology differs: pixels don't fade but stay bright until they are redrawn. The subpixel pattern, however, remains much the same—at least for these sets—albeit with much smaller scanlines.