Also called prolepsis, an interjected scene that temporarily jumps the narrative forward in time.
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The term prolepsis was used by Epicureans to describe the way the mind forms general concepts from sense perceptions.
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Several tales in the One Thousand and One Nights use this device to foreshadow what is going to happen, as a special form of literary prolepsis.
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Its use in this context could be prolepsis, as the British countryside he is describing would become the burial ground of his dead comrades and heroes from World War I.
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More examples
Anticipating and answering objections in advance
Prolepsis is the second album by the North Carolina band Arrogance, released in 1975 (see 1975 in music).
The assignment of something to a period of time that precedes it; The anticipation of an objection to an argument; A construction that consists of placing an element in a syntactic unit before that to which it would logically correspond; A so-called "preconception", i.e. ...
A hyperplastic symptom of disease in which organs appear before the natural time. (Pl. prolepses.) (20)
A figure of speech where an event in the future is referred to and anticipated. See flashback and in media res.
A literary device in which a future state is spoken of in the present; for example, a condemned man may be called a "dead man walking".
A literary device, particularly in prophecy, where the prophet treats an event as past when it is yet to occur. In Matt 22:38 Jesus refers to the destruction of Jerusalem as if one can see it now, although it will not happen for decades. ...
Speaking or acting upon something anticipated as if it were done or existing. "I'm a dead man, now!" Alternately, positioning a relative clause before its antecedent. "Consider the lilies of the field how they grow." See also: procatalepsis.