Adolf Loos was an Austrian architect known for his anti-ornamentation stance expressed in his 1908 book "Ornament and Crime." He believed that ornamentation was wasteful of labor and materials. Loos designed some of the first modern, unornamented buildings in Vienna like the Goldman & Salatsch Building (1910), which had a steel and concrete construction with a bare marble facade. His Steiner House (1910) had large front windows and a semi-circular metal roof to accommodate the site's planning code. Loos developed the concept of Raumoplan, where interconnected spaces of varying heights and functions make up the design rather than separate plans, elevations, and sections. His later Villa Muller (