Chiasmus is a literary device used throughout the Bible (including in these final chapters of Isaiah). The basic chiastic structure is for one line (or section of writing) to correspond directly with the line (or section) opposite it. Chiasmus can be as simple as two lines such as in Proverbs 15:1:
- A soft answer turneth away wrath:
- But grievous words stir up anger
Or it can be multiple lines or even chapters such as in Isaiah 59-66. (Source)