Between 1926 and 1928 the philosopher Ludwig Wittgenstein designed and built a house in Vienna for his sister. Notable for its clarity, precision, and austerity the building not only crystallized his philosophy of architecture, but served as a foil for his written work.
"There is a strong link between what Wittgenstein learned by building a house and the turn that his philosophy subsequently took, away from rigorous logic and toward a playful engagement with common speech, paradox and parable." Hugh Eakin