Rincewind had always understood that the Agatean Empire was a peaceful place. It was civilized. They invented things. In fact, he recalled, he’d been instrumental in introducing a few of their devices to Ankh-Morpork. Simple, innocent things, like clocks worked by demons, and boxes that painted pictures, and extra glass eyes you could wear over the top of your own eyes to help you see better, even if it did mean you made a spectacle of yourself.
— Terry Pratchett, Interesting Times