High Quality Content by WIKIPEDIA articles! In literature, a conceit is an extended metaphor with a complex logic that governs a poetic passage or entire poem. By juxtaposing, usurping and manipulating images and ideas in surprising ways, a conceit invites the reader into a more sophisticated understanding of an object of comparison. Extended conceits in English are part of the poetic idiom of Mannerism, during the later sixteenth and early seventeenth century.