This article tracks the origins of one of Europe's most ubiquitous instrument: the acquis. Thereby, it aims at initiating a new research program on the genealogy of Europe's cognitive and technique equipment. Instead of considering the acquis as a self-explanatory and transparent notion, the article unearths its rich political meaning, pointing at its instrumental role in shaping a law-centered, and supranational definition of Europe. Digging deep into individual and institutional genealogies, the article follows the methodological entrepreneurs who crafted new knowledge instruments for calculating Europe's State of affairs (the Celex database) and analyzes the process through which they have progressively acquired a monopoly in the calculation of 'the State of the Union,' thereby encapsulating within the very rules of the European game itself a form of 'methodological Europeanism'.Even more so than in art, architecture, and engineering, science offers the most extreme cases of complete artificiality and complete objectivity moving in parallel. (Latour 2005, 89)