Chiasmus
Pattern
AB→BA — crossed reversal creating intellectual balance
Definition
A rhetorical figure in which two successive clauses are parallel in structure but reverse the order of their key terms — creating an ABBA pattern. Chiasmus creates a distinctive crossing rhythm: the second clause mirrors the first but inverted, creating a sense of intellectual elegance and balance. The reversal forces the listener to re-hear the first clause in a new way.
Examples
Example 1
Ask not what your country can do for you — ask what you can do for your country.
John F. Kennedy, 1961
The ABBA reversal ("country can do for you" → "you can do for your country") creates a crossing pattern that transforms a policy statement into a moral imperative.
Example 2
When the going gets tough, the tough get going.
Chiastic reversal of "going/tough" and "tough/going" — the crossing pattern creates a memorable rhythm where the structure itself carries the meaning.
Example 3
We do not ride on the railroad; it rides upon us.
Henry David Thoreau
The chiasmus reverses subject and object ("we ride / it rides upon us") — the crossing rhythm embodies the reversal of control the sentence describes.
AI Detection Note
Chiasmus is extremely rare in AI text because it requires the precise inversion of structural elements — a level of syntactic planning that language models struggle with. AI generates text left to right and rarely produces the reversed mirroring that chiasmus demands. Chiasmus in a passage is a strong indicator of human authorship.
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