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Description is one of four rhetorical modes (also known as modes of discourse), along with exposition, argumentation, and narration. Each of the rhetorical modes is present in a variety of forms and each has its own purpose and conventions.
Description is also the fiction-writing mode for transmitting a mental image of the particulars of a story.

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Description as a fiction-writing mode
Fiction is a form of narrative, one of the four rhetorical modes of discourse. Fiction-writing also has distinct forms of expression, or modes, each with its own purposes and conventions. Agent and author Evan Marshall (agent) identifies five fiction-writing modes: action, summary, dialogue, feelings/thoughts, and background (Marshall 1988, pp. 143–165). Author and writing-instructor Jessica Page Morrell lists six delivery modes for fiction-writing: action, exposition, description, dialogue, summary, and transition (Morrell 2006, p. 127). Author Peter Selgin refers to methods, including action, dialogue, thoughts, summary, scene, and description (Selgin 2007, p. 38). Currently, there is no consensus within the writing community regarding the number and composition of fiction-writing modesand their uses.
Description is the fiction-writing mode for transmitting a mental image of the particulars of a story. Together with dialogue, narration, exposition, and summarization, description is one of the most widely recognized of the fiction-writing modes. As stated in Writing from A to Z, edited by Kirk Polking, description is more than the amassing of details; it is bringing something to life by carefully choosing and arranging words and phrases to produce the desired effect. (Polking, p. 106) The most appropriate and effective techniques for presenting description are a matter of ongoing discussion among writers and writing coaches.
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Purple prose
Purple prose is a term of literary