Touchstone (metaphor)
Encyclopedia
As a metaphor
Metaphor
A metaphor is a literary figure of speech that uses an image, story or tangible thing to represent a less tangible thing or some intangible quality or idea; e.g., "Her eyes were glistening jewels." Metaphor may also be used for any rhetorical figures of speech that achieve their effects via...

, a touchstone refers to any physical or intellectual measure by which the validity or merit of a concept can be tested. It is similar in use to an acid test
Acid test (gold)
An acid test is any qualitative chemical or metallurgical assay which uses acid; most commonly, and historically, the use of a strong acid to distinguish gold from base metals. Figuratively, acid test is any definitive test for some attribute, e.g...

, litmus test
Litmus test (politics)
A litmus test is a question asked of a potential candidate for high office, the answer to which would determine whether the nominating official would proceed with the appointment or nomination...

 in politics, and a shibboleth
Shibboleth
A shibboleth is a custom, principle, or belief distinguishing a particular class or group of people, especially a long-standing one regarded as outmoded or no longer important...

.

Touchstone in literature

An example in literature is the character of Touchstone
Touchstone (As You Like It)
Touchstone is an interesting fictional character in Shakespeare's play As You Like It. Touchstone is the court fool or jester, portrayed as a wise man with a dry, cynical wit. Throughout the play he comments on the other characters of the play and thus, contributes to a better understanding of the...

 in Shakespeare's As You Like It
As You Like It
As You Like It is a pastoral comedy by William Shakespeare believed to have been written in 1599 or early 1600 and first published in the folio of 1623. The play's first performance is uncertain, though a performance at Wilton House in 1603 has been suggested as a possibility...

, described as "a wise fool who acts as a kind of guide or point of reference throughout the play, putting everyone, including himself, to the comic test".

A touchstone can be a short passage from recognized masters’ works used in assaying the relative merit of poetry and literature. This sense was coined by Matthew Arnold in his essay “The Study of Poetry”, where he gives Hamlet’s dying words to Horatio as an example of a touchstone.
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