Chiasmus, the figure of speech in which two or more clauses are related to each other through a reversal of structures in order to make a larger point; that is, the clauses display inverted parallelism
Some sections of the piece have a chiastic ABCDCBA structure, and Reich noted that this one work contained more harmonic movement in the first five minutes than any other work he had previously written.
Chiastic structure, a literary device for chiasmus applied to narrative motifs, turns of phrase, or whole passages
In literary texts with a possible oral origin, such as Beowulf, chiastic or ring structures are often found on an intermediate level, that is, between the (verbal and/or grammatical) level of chiasmus and the higher level of chiastic structure such as noted in the Torah.