Discipline and Punish (1975) opens with a genuinely shocking passage: the 1757 public execution of Damiens the regicide, described in clinical detail. He was drawn and quartered, his flesh torn with pincers, his wounds filled with burning sulphur, his limbs pulled off by horses. The crowd watched. This was the theater of sovereign power: punishment as public spectacle, the king's violence displayed on the criminal's body as a demonstration of unlimited sovereign force.
Fifty years later: the prison timetable. Every hour of the prisoner's day is scheduled. Prisoners are individually assigned to cells, monitored for behavior, assessed for moral progress, subject to detailed administrative record-keeping. Punishment has moved from the body to the soul, from spectacle to surveillance, from sovereign theater to institutional management. Foucault's question: this is usually narrated as progress, we stopped torturing people in public and started reforming them in institutions. But is it?
His answer is among the most provocative in modern thought: the shift from torture to imprisonment is not the progress of humanitarian sensibility. It is a refinement and expansion of power, not its limitation. Public execution was dramatically violent but episodically inefficient: you could only discipline someone once they had already committed a crime, and the theater of punishment was notoriously unreliable (crowds sometimes sympathized with the condemned). The modern prison, by contrast, aims at continuous, total modification of the subject: not just punishing behavior after it occurs but producing a kind of person who monitors themselves, who has internalized the norms of the institution. This is far more efficient and far more total.
The architectural device that captures this perfectly is Jeremy Bentham's Panopticon: a prison design in which a central observation tower is surrounded by a ring of backlit cells. Each prisoner can be seen at all times from the tower. The important feature: the prisoner cannot see whether anyone is watching from the tower at any given moment. So they must act as if they are always being watched. The actual surveillance is discontinuous; the effect of surveillance becomes permanent. As Foucault, citing the primary sources, notes: the Panopticon "induces in the inmate a state of conscious and permanent visibility that assures the automatic functioning of power." Power can render its actual exercise unnecessary because the subject does it themselves.
Foucault's argument is not that prisons look like Panopticons. It is that panopticism, the logic of hierarchical surveillance, normalizing judgment, and the examination, has spread throughout modern society. Schools use it: students are graded, ranked, assessed, and compared against a norm. Hospitals use it: patients are monitored, their bodies documented, their pathologies classified. Factories use it: workers are observed, their output measured, their deviations corrected. Armies use it: soldiers are drilled, ranked, and subjected to constant inspection. In each case, the same technology operates: individualization through the gaze (the individual becomes the target of knowledge-production), normalization through comparison (the individual is measured against a standard), and examination as ritual (the recurrent moment at which surveillance and normalization are enacted).
The concept of docile bodies is central: disciplinary power does not primarily operate through prohibition (you are not allowed to do X). It operates by producing useful, trainable, manageable bodies and subjects. The soldier whose body has been drilled into military bearing is not merely constrained, their body has been transformed. The student who has internalized academic norms and self-monitors their performance has not just been coerced, their subjectivity has been constituted. This is why Foucault says that power is not only repressive but productive: it makes things, produces subjects, creates capacities, constitutes knowledge. And this is why it is so hard to resist: there is no pure self outside the power relations that constituted it to which one can retreat for an uncontaminated standpoint.