There will exist unusual prisons with strange and perverted forms of torture like engraving with a pin on a body of a person his "sin" so many times until he would die.
The story is considered to be a very precise prediction of Nazis regime and German concentration camps with its brutal mass tortures and death. Also of great immorality and victory of material values, the destruction of ethics.
Kafka, Franz. 2011. In the penal colony. London: Penguin.