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Mistero Buffo, Dario Fo's renowned solo masterpiece, is a collection of medieval mystery plays that Fo adapted and performed in a unique and highly engaging style. These plays, rooted in the tradition of popular theater, explore themes of social justice, religious hypocrisy, and the power of the common people. Fo's performance is characterized by his use of masks, physical comedy, and audience interaction, creating a dynamic and immersive theatrical experience.