The shared question running through these texts is not simply how systems are built, but how abstraction becomes spatially operative. Sohn-Rethel gives the most severe epistemological formulation: abstract thought is not born in the pure interiority of mind, but in the social form of exchange, where commodity relations produce real abstraction before philosophy names it. Bowker and Star move this problem into classification, showing that categories are not neutral containers for knowledge but infrastructures that coordinate labour, produce visibility, distribute suffering and stabilise institutional memory. Latour’s account of inscription extends the same problem into scientific practice: facts travel because they are drawn, fixed, displaced, circulated and recombined through graphic and documentary devices. Deleuze and Guattari provide the counter-image to arborescent order: the rhizome, the assemblage, the book as machine, the field made from exterior relations rather than from a sovereign centre. Easterling then shifts infrastructure from technical substrate to political medium: zones, broadband systems, logistical formats and spatial products govern by disposition, by repeatable protocols, by the quiet power of arrangement. Mattern and Parks deepen the temporal and material register of this claim by treating media infrastructure as urban sediment, signal traffic, cable, tower, ruin, acoustic condition, civic substrate and historical residue. Together, the texts form a precise constellation: knowledge is never merely represented; it is supported, sorted, formatted, carried, exchanged, buried, exposed and made durable by the material grammars that allow it to circulate. The problem is therefore not the opposition between abstraction and matter, but their mutual production. Abstraction works because it has sites, surfaces, standards, routes, diagrams, archives, classifications, media channels and infrastructural habits. Matter becomes epistemic when it is inscribed, named, transmitted, compared, indexed and made available to a public or institutional regime. The nexus is strongest where these authors dissolve the naïve hierarchy between idea and support. The support is not secondary. The category is not posterior to the world. The diagram is not an illustration after the fact. The zone is not only territory. The cable is not only technical. The book is not only content. Each operates as a device for arranging relations, and each relation modifies what can count as knowledge, evidence, locality, memory or public fact. This is why the field belongs together: it reads infrastructure as the hidden morphology of thought, and thought as an infrastructural event whose forms are never innocent.
