Amber

Amber is the fictional city in Roger Zelazny's Chronicles of Amber series.

"...Amber is the one true world in which all others worlds, including our Earth, are but mere shadows" 

Amber is the first shadow of the primal plane of Order, the city of Amber is the archetype of all cities. Amber casts an infinite number of shadows in all directions in which our own Earth is just but one. The further one travels from Amber the more drastic the changes to the environment become. The Royals of Amber who have negotiated the Pattern can freely travel through the shadows. By shifting between shadows, one can appear to alter reality by simply choosing which elements of which shadows to keep, and which to switch between.