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The novel also explores the theme of illusion vs. reality. The Wizard of Oz, who appears to be a powerful and intimidating figure, is ultimately revealed to be a humbug. This serves as a commentary on the nature of power and the importance of looking beyond surface-level appearances.

"The Wonderful Wizard of Oz" has had a profound impact on children's literature. The novel's innovative use of fantasy and adventure elements has influenced generations of authors, including C.S. Lewis, J.K. Rowling, and Neil Gaiman. The character of Dorothy has become an archetype, inspiring countless adaptations and reinterpretations in film, stage, and literature.