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In page Conceit:

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In English literature the term is generally associated with the 17th century metaphysical poets, an extension of contemporary usage. The metaphysical conceit differs from an extended analogy in the sense that it does not have a clear-cut relationship between the things being compared.[1] Helen Gardner[2] observed that "a conceit is a comparison whose ingenuity is more striking than its justness" and that "a comparison becomes a conceit when we are made to concede likeness while being strongly conscious of unlikeness." An example of the latter occurs in John Donne's "A Valediction: Forbidding Mourning", in which a couple faced with absence from each other is likened to a compass.