John Fowles's The French Lieutenant's Woman and Lawrence Norfolk's Lemprière's Dictionary both employ digressions to offer scholarly background to the fiction, while others, like Gilbert Sorrentino in Mulligan Stew, use digression to prevent the functioning of the fiction's illusions.
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In Classical rhetoric since Corax of Syracuse, especially in Institutio Oratoria of Quintilian, the digression was a regular part of any oration or composition.