From the Introduction:
It’s hard to imagine the impact of just a few words. Tell players that the land is green and lush, birds singing, and people laughing. They get a certain idea of the environment. Contrast that with a land of broken concrete and molten fire. Words trigger images in the mind while mental landscapes develop almost on their own. GMs have a lot of power because their words come first. They define the world. Players come up with assumptions, expectations, and theories based upon those GM definitions.
People only travel to the purple islands infrequently. It is this lack of tourism that gives it mystery. After all, everyplace is a bit weird once you first lay eyes on it. Those seeking adventure will find it. Those brought to the islands against their will should have their hands full.