Modern art in Croatia began with the Secession ideas spreading from Vienna and Munich, and post-Impressionism from Paris. Young artists would study the latest trends and integrate them into their own work. Many strove to bring a native cultural identity into their art, for example themes of national history and legends, and some of the artwork following the First World War contained a strong political message against the ruling Austro-Hungarian state. A change was noticeable in 1919 with a move to flatter forms, and signs of cubism and expressionism were evident. In the 1920s, the Earth Group sought to reflect reality and social issues in their art, a movement that also saw the development of naive art. By the 1930s there was a return to more simple, classical styles.