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When a character starts the work talking directly with the reader, we can perceive an affinity effect between narrator and reader, leaving the work more personal and with a more confident effect. The reader, then, begins to be part of the work, as a person who is being confidant of the narrator and receiving all the report first hand.
Format is the organizational structure of a text. An author might alter the format of a literary work to highlight the differences between things, especially when he or she is trying to deliver information about the contrasts between different situations, characters, or other aspects of the work.
