 While Kantian perspectives—the a priori “constitution of the object”—still linger, the “Philosophical Significance of the Theory of Relativity”, published in French in 1922, signals a break with some of Reichenbach’s previous views (1922c). Perhaps influenced by Einstein’s “Geometry and Experience” (1921) Reichenbach no longer holds that, contrary to the conventionalist views he attributes to Helmholtz and Poincaré, the theory of relativity has established a geometry as part of physics to which there can be no empirically adequate alternative. After introducing the idea of a universal force affecting all objects no matter how insulated, and noting that gravitation as usually conceived is such a force, Reichenbach writes that: “The solution to the problem of space is…found only in this conception we call conventionalism…which goes back to Helmholtz and Poincaré.” (Reichenbach, 2006, p. 135). The idea that empirically indistinguishable hypotheses differ only verbally—“equivalent descriptions” in Reichenbach’s terminology—is already developed here. 