'Haus Wittgenstein' AKA 'The Wittgenstein House' AKA 'The Stonborough House'. Wittgenstein received an invitation from his sister Margaret ("Gretl") Stonborough (who was painted by Gustav Klimt in 1905) to work on the design and construction of her new house. He worked with the architect, Paul Engelmann, who had become a close friend of Wittgenstein's during the war, and the two designed a spare modernist house. Wittgenstein found the work intellectually absorbing and exhausting; he poured himself into the design in painstaking detail, including even small aspects such as doorknobs and radiators, spending a year on each as they had to be exactly positioned to maintain the symmetry of the rooms.[
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Haus Wittgenstein

Haus Wittgenstein, (also known as the Stonborough House and the Wittgenstein House) is a house in the modernist style designed and built on the Kundmanngasse, Vienna, by the Austrian architect Paul Engelmann and the Austrian philosopher Ludwig Wittgenstein.

In November 1925, Wittgenstein's sister Margaret Stonborough-Wittgenstein commissioned Engelmann to design and build a large townhouse. Margaret also invited her brother to help with the design in part to distract him from an incident that had happened while he had been a primary school teacher: he had hit a boy for getting an answer wrong and the boy had collapsed. The architect was Paul Engelmann, someone Wittgenstein had come to know while training to be an Artillery Officer in Olmutz. Engelmann designed a spare modernist house after the style of Adolf Loos: three rectangular blocks. Wittgenstein showed a great interest in the project and in Engelmann's plans and poured himself into the project for over two years. He focused on the windows, doors, door knobs, and radiators, demanding that every detail be exactly as he specified, to the point where everyone involved in the project was exhausted. One of the architects, Jacques Groag, wrote in a letter: "I come home very depressed with a headache after a day of the worst quarrels, disputes, vexations, and this happens often. Mostly between me and Wittgenstein." When the house was nearly finished he had a ceiling raised 30 mm so the room had the exact proportions he wanted.

Waugh writes that Margaret eventually refused to pay for the changes Wittgenstein kept demanding, so he bought himself a lottery ticket in the hope of paying for things that way. It took him a year to design the door handles, and another to design the radiators. Each window was covered by a metal screen that weighed 150 kg, moved by a pulley Wittgenstein designed. Bernhard Leitner, author of The Architecture of Ludwig Wittgenstein, said of it that there is barely anything comparable in the history of interior design: "It is as ingenious as it is expensive. A metal curtain that could be lowered into the floor."

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Ludwig Wittgenstein

Ludwig Josef Johann Wittgenstein (26 April 1889 – 29 April 1951) was an Austrian-British philosopher who worked primarily in logic, the philosophy of mathematics, the philosophy of mind, and the philosophy of language. From 1939–1947, Wittgenstein taught at the University of Cambridge. During his lifetime he published just one slim book, the 75-page Tractatus Logico-Philosophicus (1921), one article, one book review and a children's dictionary. His voluminous manuscripts were edited and published posthumously. Philosophical Investigations appeared as a book in 1953 and by the end of the century it was considered an important modern classic. Philosopher Bertrand Russell described Wittgenstein as "the most perfect example I have ever known of genius as traditionally conceived; passionate, profound, intense, and dominating".

Born in Vienna into one of Europe's richest families, he inherited a large fortune from his father in 1913. He gave some considerable sums to poor artists. In a period of severe personal depression after the first World War, he then gave away his entire fortune to his brothers and sisters. Three of his brothers committed suicide, with Wittgenstein contemplating it too. He left academia several times: serving as an officer on the frontline during World War I, where he was decorated a number of times for his courage; teaching in schools in remote Austrian villages, where he encountered controversy for hitting children when they made mistakes in mathematics; and working during World War II as a hospital porter in London, where he told patients not to take the drugs they were prescribed, and where he largely managed to keep secret the fact that he was one of the world's most famous philosophers. He described philosophy, however, as "the only work that gives me real satisfaction."