In September 1919, fresh from the trenches of World War I and having newly completed his Tractatus Logico-Philosophicus,  Wittgenstein enrolled at the Lehrerbildungsanstalt (teacher-training college) on Kundmanngasse in Vienna. Seeking spiritual purification and a simple purpose away from his family’s immense wealth, the thirty-year-old philosopher endured a spartan, often humiliating year inside classrooms filled with teenage high school graduates. In a striking twist of geographical fate, the historic college building sat directly opposite the site where he would eventually design and build the radically modernist Haus Wittgenstein for his sister, Margaret "Gretl" Stonborough (see other recording). After finishing his training at Kundmanngasse in 1920, Wittgenstein embarked on his turbulent six-year stint as a rural elementary school teacher, entirely unaware that he would return to this exact Viennese street in 1926 as a self-taught architect to erect a monument of absolute geometric precision directly facing his old training college.