The document discusses two types of stories - ones where the conclusion is already known, and ones where it is not. For stories with a known conclusion, layers can be used to organize story elements. Layers represent relationships between elements and allow for manipulation through iteration, juxtaposition, hiding and revealing. For stories without a known conclusion, layers become an experiment in meaning making through similar techniques. Layers contain the history of drafts and represent the fluid nature of deriving meaning in digital creative works.