Gottfried Keller's 'Der Grüne Heinrich' is a poignant and introspective autobiographical novel that delves into the life of a young man named Heinrich. Set against the backdrop of 19th-century Switzerland, Keller masterfully explores themes of self-discovery, love, and societal expectations. The novel is written in a lyrical and poetic style, showcasing Keller's skill as a wordsmith and his deep understanding of human emotions. 'Der Grüne Heinrich' is considered a classic of European literature, with its rich character development and vivid portrayal of the protagonist's journey towards maturity.