Radical art movements are artistic expressions that challenge traditional norms and conventions. They often seek to provoke thought, inspire change, or address social and political issues. Examples include Dadaism, which emerged as a reaction to World War I, and Surrealism, which explored the unconscious mind and dreams. These movements frequently use unconventional materials and techniques to convey their messages. Artists like Marcel Duchamp and Pablo Picasso played significant roles in these movements, pushing boundaries and redefining what art can be. Radical art encourages viewers to question societal values and consider new perspectives.