Many modernists believed that by rejecting tradition they could discover radically new ways of making art. Arnold Schoenberg believed that by rejecting traditional tonal harmony, the hierarchical system of organizing works of music which had guided music making for at least a century and a half, and perhaps longer, he had discovered a wholly new way of organizing sound, based in the use of twelve-note rows (See Twelve-tone technique). This led to what is known as serial music by the post-war period. Abstract artists, taking as their examples the Impressionists, as well as Paul Cézanne and Edvard Munch, began with the assumption that color and shape formed the essential characteristics of art, not the depiction of the natural world. Wassily Kandinsky, Piet Mondrian, and Kazimir Malevich all believed in redefining art as the arrangement of pure colour. The use of photography, which had rendered much of the representational function of visual art obsolete, strongly affected this aspect of modernism. However, these artists also believed that by rejecting the depiction of material objects they helped art move from a materialist to a spiritualist phase of development.…