Since the so-called “type-debate” at the 1914 Werkbund Exhibition in Cologne—on individual versus standardized types—the discussion about turning Function into Form has been an important topic in Architectural Theory. The aim of this article is to trace the historic shifts in the relationship between Function and Form: First, how Functional Thinking was turned into an Art Form; this orginates in the Werkbund concept of artistic refinement of industrial production. Second, how Functional Analysis was applied to design and production processes, focused on certain aspects, such as economic management or floor plan design. Third, how Architectural Function was used as a social or political argument; this is of particular interest during the interwar years. A comparison of theses different aspects of the relationship between Function and Form reveals that it has undergone fundamental shifts—from Art to Science and Politics—that are tied to historic developments. It is interesting to note that this happens in a short period of time in the first half of the 20th Century. Looking at these historic shifts not only sheds new light on the creative process in Modern Architecture, this may also serve as a stepstone towards a new rethinking of Function and Form.