system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why when I use my electric toothbrush do the numbers on the alarm clock dance around, but nothing else I look at moves similarly?
gpt
Because everything else isn't a blinking light. If you take a string with an LED on it, and spin it really fast you can see if it is blinking or constantly on, because it effectively spreads out the "framerate" in space.