During the 19th century, there were significant developments in art, culture, and education. Romanticism emerged in the first half of the century as an artistic movement that celebrated nature and emotion in response to industrialization. Realism developed in the second half to provide a realistic portrayal of everyday life and social commentary. Famous artists from this period included Delacroix, Courbet, and Millet. Architecture also evolved with the rise of iron construction and revival of historic styles. World's fairs grew in popularity as international exhibitions to showcase countries' achievements.