This chapter analyzes the confluence in thinking about cinematic and architectural montage in the work of the Russian filmmaker Sergei Eisenstein and the Swiss architect Le Corbusier. It describes their encounter in Moscow in 1928 and their shared admiration for the French architectural historian Auguste Choisy, whose description of spatial passage through the Athenian Acropolis is a key point of reference in the accounts the filmmaker and the architect develop of the role of narrative, movement, and editing in the apprehension of space. Although Le Corbusier’s promenade architecturale is the manipulation of a body moving through actual space according to precise calculations of a visual sequence, the cinematic version, as staged by Corbusier and Chenal, faced the viewer with a surrogate or avatar body moving through space, but never presented the viewer with the scenes viewed by this body: an invisible, one might say ineffable merging of architecture with the image of an invisible architecture as a projection of a static viewer. Architecture in this sense achieves the status desired of the modernist machine universe, but in the process has been reduced to two dimensions, without perspective. Eisenstein, for his part, was in this sense able to “build” an architecture in film—not the imperfect static forms that one had to walk through or work hard to imagine their ecstatic movement, but through the moving image itself understood as the highest technological achievement of modernism, thus achieving the (ecstatic) dissolution, in image, of modernist architecture.