Hall’s reading of Foucault is a compact masterclass in translating dense French philosophy into usable critical method. The chapter’s great achievement is to move discourse away from the thin idea of language as mere expression and toward the thicker idea of discourse as an architecture of reality. Hall explains that discourse does not simply describe objects; it produces the field in which objects can appear, circulate, be named, judged, administered and transformed into knowledge. A city, a body, a school, a border, a population or a neighbourhood is never simply “there” before language. It becomes socially operable through descriptions, diagrams, categories, expert statements, institutional procedures and visual regimes. Hall also clarifies the linked triad of discourse, power/knowledge and the subject. Power is not held only by sovereign actors; it circulates through institutions, professions, classifications and everyday routines. Knowledge is never innocent because what counts as truth depends on authorised procedures of verification. The subject is formed through historically specific regimes that tell people what they are, what they may say and where they may be placed. Hall makes Foucault usable without domesticating him, and the chapter remains an indispensable entrance for anyone wanting to understand how representation is a productive force, not a mirror.