“Raumplan suggests that spaces within a building should be differentiated in size, height, and character according to their intended use.”
Raumplan is a design philosophy prioritises the practical and experiential aspects of the architecture with an emphasis on functionality and efficiency. A concept introduced by architect Adolf Loos, a staunch advocate of modernism, was a fierce critic of ornamentation in architecture, which he viewed as superfluous.
Landmark Looshaus
Contrary to the austere exterior, the interior of the Looshaus showcases a remarkable richness and warmth. It is an intimate domestic space characterized by a lavish use of luxurious materials like marble, wood, silk, and brass.
Reference: https://archeyes.com/the-looshaus-by-adolf-loos-a-manifesto-of-ornamentation-and-crime/