This is how the "violet cusps" from The Eyes of the Overworld were made..

https://en.wikipedia.org/wiki/The_Eyes_of_the_Overworld

"There, Cugel finds two bizarre villages, one occupied by wearers of the magic violet lenses, the other by peasants who work on behalf of the lens-wearers, in hopes of being promoted to their ranks. The lenses cause their wearers to see, not their squalid surroundings, but the Overworld, a vastly superior version of reality where a hut is a palace, gruel is a magnificent feast, and peasant women are princesses — "seeing the world through rose-colored glasses" on a grand scale."