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There is a real world—the world that we all know and love (or hate, as the case may be)--and a fantasy world created by our illustrious author. These two worlds are separate, but travel between them is possible. This sub-genre is part of alternate world fiction and, as the name so obviously indicates, portals into the alternate world are the primary piece of world-building. - See more at:
http://bestfantasybooks.com/portal-fa...