Earlier in a story, opinion/assumption X is associated with Alice, and opinion/assumption Y is associated with Bob. Later in the story, Y is associated with Alice and X is associated with Bob instead. Note that "perspective" is not literally a physical perspective but is used to refer to either opinions or assumptions; this can apply to either. May in some cases result in an Ironic Echo. See also Hourglass Plot. Examples of Perspective Reversal include: