Modernism is an overarching term used to describe a succession of art movements that occurred between the mid-19th and mid-20th centuries. Although these movements vary greatly in style, they are united by a common set of principles: a repudiation of tradition and conservative values (such as religious moralising in painting), a bold experimentation with form, often to the point of abstraction, and an innovation in technique, materials and process. As a broad movement, modernism reflected the rapid acceleration of societal and technological change brought about by the Industrial revolution in the first half of the 19th century, as artists worked to present, idealise and propel the possibilities of modern life. The invention of photography in the same century was of particular significance to the movement, driving innovations in artistic representation that were beyond the realms of photographic possibility, whilst simultaneously offering a new medium for experimentation. The key styles encompassed by the modernist movement include: Realism (notable for its depiction of daily life on a scale traditionally reserved for history painting), Impressionism, Post-impressionism, Fauvism, Cubism, Suprematism, Constructivism, De Stijl, Dada, Surrealism, Abstract expressionism and Minimalism.