The famous artist known for producing works that challenge social norms is Pablo Picasso. A leading figure in the Cubist movement, Picasso revolutionized modern art with his innovative approaches to form and perspective. His works often critiqued societal issues and depicted themes like war, love, and identity, most notably in masterpieces such as "Guernica", which serves as a poignant anti-war statement. Picasso's ability to continually evolve his style throughout his career has solidified his position as one of the most influential artists of the 20th century.