Story worlds
The fabric of details that make the story believable (familiar vs unfamiliar).
It incorporates characters, places, objects, costumes, architecture, language, props, etc. They are more important if there are many stories told about them.
"Worlds extend beyond the stories that occur in them, inviting speculation and exploration through imaginative means” (Wolf, citado por Pratten, 2011, p.32.).
They are not stories, but they holds evidence and elements from which the stories are mede. If it is a large storyworld, writers create a "storyworld bible" to document all the aspects.
Marks premises: the more distant a world is from the audience’ experience, the easier it is to create belief in the world. and the storyworld is often separated from our experience of the real world by a "portal ".