"The Nose" is a satirical short story by Nikolai Gogol. Written between 1835 and 1836, it tells of a St. Petersburg official whose nose leaves his face and develops a life of its own.
"The Metamorphosis" is a novella by Franz Kafka, first published in 1915. It has been cited as one of the seminal works of fiction of the 20th century and is studied in colleges and universities across the Western world. The story begins with a traveling salesman, Gregor Samsa, waking to find himself transformed into a monstrous vermin. It is never explained in the story why Samsa transforms, nor did Kafka ever give an explanation.