This is a very good question!
Günter Grass's novel The Tin Drum uses various unusual stylistic devices to convey to the reader a sense of the protagonist and narrator, Oskar Matzerath, a man growing up in Nazi Germany. The narrator, precociously mature at the age of three, decides to stop growing and remains physically a toddler out of disgust at the adult world even as he mentally matures.
Oskar has supernatural abilities. He is capable of screaming so loudly that he can shatter objects. He also was given a tin drum, purchased from a Jewish-owned music store (shortly thereafter destroyed by the Nazis), which he keeps with him all the time and constantly plays.
The character of Oskar displays many of the obsessive and repetitive habits that we would now describe as symptoms of autism, from his constant drumming to his screaming tantrums. The repetitive language in the book evokes this sense of repetitive behaviors and sounds.