The Wittgenstein house at Kundmanngasse in Vienna is considered a landmark of early modern architecture. In 1925, Margaret Stonborough commissioned Paul Engelmann, a student of Adolf Loos, for planning her new townhouse. Only one year later, however, her brother, the philosopher Ludwig Wittgenstein had taken the project under his wings, shaping - on the basis of his own systematic theory of aesthetics - both the construction and design of the structure as well as the smallest functional details of interior design. The building is characterized by the austerity of its cubic structures, a transparency achieved by a controlled flow of light, its spatial division and coloration as well as a formal functionalism and numerous technical innovations. The architect and artist Bernhard Leitner, whose efforts largely saved the palais from having to make room for a high-rise project in 1971, published his first extensive documentation on the architect Wittgenstein in 1973. In this book, which includes numerous sketches, drawings, plans and photographs, Bernhard Leitner expertly presents the newest details of his research on Wittgenstein.