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Einstein Tower: The monument of Expressionism
The Einstein Tower (1920–1921, Potsdam) is Mendelsohn's first built work and the enduring icon of German Expressionist architecture. Designed as an observatory for the astrophysicist Erwin Freundlich, it was originally planned in reinforced concrete — a material that can be cast into any curve — but postwar material shortages forced Mendelsohn to build most of the structure in brick, clad in cement stucco to mimic concrete's plastic appearance. The result was unexpectedly successful: a building that completely refuses the straight line, every curve, every window opening, every cornice seeming like a sand dune shaped by wind or rock scoured by water.
The Einstein Tower's function — housing a vertical solar telescope — has no traditional "fit" with its form. The telescope required a vertical shaft running from the tower crown down to an underground laboratory, but the tower's morphology was not "deduced" from this function; it "emerged" from an intuition about Einstein's theory of relativity. Mendelsohn wanted a "dynamic architecture" — not one that represents motion but one that is itself a frozen moment of motion. Einstein himself visited the tower and reportedly uttered a single word: "organisch" (organic). Whether this was praise or bemusement, it aptly describes this building's quality: it seems like an organism, not an artifact.











