Mattern’s “Deep Time of Media Infrastructure” argues that media infrastructure did not begin with telecommunications, electronic networks or contemporary smart cities, but with the earliest urban forms that organised communication, ceremony, inscription and public address. Her central intervention is to stretch media history backwards into archaeology, urban history and architectural history, showing that cities have always been communicative environments whose streets, walls, plazas, facades, voids and acoustic volumes function as media systems. Rather than treating infrastructure as a modern technical layer, Mattern presents it as deep time: a long historical accumulation in which oral, written, architectural, graphic, sonic and digital forms coexist, overlap and reshape one another. Her examples range from the agora and Roman Forum as acoustic infrastructures for governance, to public inscriptions on ancient buildings, Fatimid Cairo’s exterior texts, Chinese stone writings, Yemeni spiral urban forms and New York’s Union Square as a democratic space of assembly. The illustrated plans and urban images in the chapter reinforce this argument visually, showing how public space itself becomes a communicative apparatus rather than a neutral container. As a case-study synthesis, the smart city becomes the negative example: when contemporary developments privilege seamless digital systems while suppressing informal, residual and embodied communication, they risk becoming over-rationalised machines rather than living cities. Ultimately, Mattern concludes that media infrastructures must be studied as layered techno-socio-spatio-material entanglements, shaped by path dependency, informal practices, human labour, scale and historical residue. Her decisive claim is that to understand media cities adequately, one must excavate not only cables and screens, but also voices, walls, streets, inscriptions and the longue durée of urban mediation.
