I love how Discworld uses the fact that the world is a disc for its world building in actually interesting ways.
Not just the obvious stuff like the danger of people falling off the edge, but how instead of the cardinal directions, they use "hubwards" and "rimwards" because the mountains in the center of the disc can be seen from pretty much anywhere.
Or how the speed of light is significantly slower, which makes earth-like sunrises and sunsets on a disk possible. But this also leads to lines like "On a clear day, you could see all the way to last Wednesday" and descriptions of sunlight literally flooding over mountains like glowing honey.
But one of my favorite bits of disc related lore are the clacks towers.
These towers use the six lights on the top to relay messages over huge distances. Much greater distances than would be possible on earth, since the horizon would get in the way after 10 kilometers or so.
It's basically Discworld's version of radio towers before the discovery of electricity, and it's something that would only work that well on a flat world.
Oh, and they're called clacks because the shutters make a clacking sound when in operation, which just feels so realistic as far as nicknames go, like, of course people would call them clacks or clackers or something like that.
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