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On the sign:
IN DIESEM HAUSE WOHNTE VON 1903-1933 DER GROSSE HUMANIST UND ARCHITEKT ADOLF LOOS 1870-1933
KULTURAMT DER STADT WIEN ÖSTERREICHISCHE GESELLSCHAFT FÜR ARCHITEKTUR
The sign is on the wall of the building where one of the pioneers of modern architecture of the 20th century lived. Known mainly from the theoretical side, thanks to the book he wrote in 1908 in which he opposed the neoclassical style that was common at the time.