Some sentences feel balanced because their second half turns back through the first. Chiasmus is the name for that crossed arrangement: elements introduced in one order return in reverse order. The pattern is often described as ABBA.
The Poetry Foundation’s glossary identifies the reversal of grammatical structures or ideas. Exact repetition of the same words is not required for every example of chiasmus. When identical words are repeated in reverse order, the related term antimetabole can also be relevant; literary terminology sometimes overlaps.
Draw the crossing before naming it
Consider this original example: “We shape our rooms, and our rooms shape us.” Mark “we/us” as A and “rooms” as B. The first clause moves A to B; the second moves B to A. The reversal asks the reader to consider influence in both directions.
Now compare the plain alternative: “People affect their surroundings, which can also affect them.” It communicates a similar idea, but the crossed version gives the relationship a memorable shape. Neither sentence proves how strong that influence actually is.
Look for a change in meaning
When you encounter a reversal in a poem, speech or essay, ask what the second half adds. Does it complicate the first claim, show mutual dependence, or present an opposition? If it only rearranges words, the sentence may be elegant without becoming more insightful.
As a reading exercise, copy a short passage into two columns and place the corresponding ideas opposite one another. Then read the surrounding paragraph. The context may reveal irony that disappears when the line is quoted alone.
Use it sparingly in your own writing
Write the argument plainly first. Try a reversed structure only when the relationship genuinely works in both directions. For an invented slogan such as “We choose our habits; our habits choose our days,” test the second clause: it is figurative, not a literal explanation of decision-making.
That final check matters. Symmetry gives prose confidence, but confidence is not evidence. Chiasmus is most satisfying when the structure helps readers notice a real relationship rather than concealing a weak claim behind a neat turn of phrase.