René Karl Wilhelm Johann Josef Maria Rilke, better known as Rainer Maria Rilke, was a Bohemian-Austrian poet and novelist, "widely recognized as one of the most lyrically intense German-language poets", writing in both verse and highly lyrical prose, these deeply existential themes tend to position him as a transitional figure between the traditional and which philosophical movement that, along with cultural trends and changes, arose from wide-scale and far-reaching transformations in Western society during the late 19th and early 20th centuries?