"Wunderbare Reise des kleinen Nils Holgersson mit den Wildgänsen: Ein Kinderbuch" by Selma Lagerlöf is a novel first published in 1906/1907. Fourteen-year-old Nils Holgersson, a cruel and lazy farm boy, is transformed into a tiny elf as punishment. He flies across Sweden on the back of a domestic goose traveling with wild geese, experiencing adventures while learning about his country's geography, history, and culture. Through his journey, Nils must prove himself morally and earn his way back to humanity.