system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What creates the “zooming out” effect you see when you shut off a TV or computer?
gpt
If you mean on really old CRT screens, the whole picture was drawn by a single point flying across the screen very fast, horizontally, then stepping down a vertical level and repeating. When you turn it off, the inputs driving that beam go to 0v. The outputs of that beam are at high voltage so take a little while to drain, causing the beam to sort of sit on one line, which eventually shrinks to a point, before the power source of the beam dies too.