CONCEPT
Typographical Fixity
Eisenstein's foundational concept: the property by which every printed copy is identical to every other, ending the scribal-era fluidity that had undermined cumulative knowledge-building for a millennium.
Typographical fixity is the property that most distinguished print from manuscript culture: the guarantee that every copy of a printed edition was identical to every other copy. Before the press, textual fluidity was structural — each scribal reproduction introduced variations, and accumulated errors across generations of copying made cumulative knowledge-building nearly impossible. Fixity enabled citation with confidence, systematic textual comparison (collatio), and the collaborative enterprise that became modern science. Eisenstein treated fixity not as a mere convenience but as the precondition for cumulative inquiry — the structural foundation without which Copernicus could not be corrected by Kepler, Ptolemy could not be tested against observation, and the collaborative enterprise of natural philosophy could not become science.
In The You On AI Field Guide
Eisenstein argued that fixity operated as a causal mechanism distinct from dissemination and standardization, producing consequences neither could explain alone. In the manuscript era, the fluidity of texts shaped the entire structure of intellectual life: knowledge was local, because versions in Paris