Jean-Baptiste Chéreau was born in 1907 and was primarily inspired by the 1920s. The notable innovations formed in the early years of the 20th century were developed further in the 1920s and 1930s. This period established the careers of many innovative and inspiring practitioners in the pictorial arts. However it was a period of reflection following the horrors of the First World War, and significant shifts in politics took place internationally. The philosophy of Marxism was widespread among artist communities and groups. In Paris, artists such as Brancusi, Modigliani and Soutine developed methods of art which were dramatic and dynamic. Surrealism continued to mature in the 1920s and 1930s, and focused on the human unconscious and Freudian theory. Significant artists to arise from this movement were Salvador Dali, Giorgio de Chirico, Andre Breton, Rene Magritte and Paul Delvaux. Surrealism spread as an ideology on a global scale due to its cultural significance, and grew to become the central expressive mode of the 1920s. It was aided by the liberal characteristics of Weimar Republic in Germany, and flourished under this way of thinking.