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I couldn't sleep last night and ended up working on a terminal-based recreation of the old Starry Skyline screensaver we had on our computers when I was a kid (part of the After Dark suite of screensavers). It's been a lot of fun to work on and I'm enjoying thinking of what else I can add to it beyond the simple office windows and stars. I just got finished adding fireworks and I'm real pleased with how they turned out.
https://github.com/Whelk/asciiskyline
This is my first time working with curses so it's serving as a useful learning experience. Hoping to throw together some TUI utilities once I'm comfortable enough with it.
I'm not sure how actually practical compared to fun screensavers were in the CRT era, but in theory, their practical side is at least somewhat back.
The original idea was that you don't want the same phosphors to be illuminated all the time, or that breaks them down a bit more than those that aren't, and reduces their brightness; you get burn-in.
LCD displays aren't really affected by this. The LCD elements don't decay from being in on or off mode, and the backlight, which does decay, (usually) covers the whole screen, so the whole screen decays evenly.
But OLED displays do have the ability to get burn-in again, since the LED elements are per pixel, and the LEDs decay with power-on time.
Yep, I'm in it for the fun.