The document discusses various artists and art movements from the 20th century that challenged traditional forms of art and culture. It mentions Dadaists like Hugo Ball and Tristan Tzara who created cut-up poems to protest bourgeois values. Surrealists like Man Ray incorporated found objects and photography to express political ideas. Contemporary artists like JR, Dan Witz, and Seed Bombers use public spaces and guerrilla tactics to raise awareness of social issues. Feminist artist Judy Chicago highlighted women's history. Fluxus embraced multi-disciplinary works and Yoko Ono created participatory sculptures.