Successive phrases or verses with the same construction, so that the reader compares what changes from one to the next.
In Notes from Underground
I have not been able to become not merely wicked, but not even anything at all: neither wicked nor good, neither a scoundrel nor honest, neither a hero nor an insect.
Six «nor» in a row repeat the same construction, in pairs: «nor wicked, nor good, nor scoundrel, nor honest». The regularity of the mold makes it seem that each defect is measured with the same ruler, and the emptiness takes the form of a list.