As Bentham realized and Foucault emphasized, the system workseven if there is no one in the guard house. The very fact of generalvisibility-being seeable more than being seen-will be enough toproduce effective social control.4 Indeed, awareness of being visiblemakes people the agents of their own subjection. Writes Foucault,He who is subjected to a field of visibility, and who knows it, as-sumes responsibility for the constraints of power; he makes themplay spontaneously upon himself; he inscribes in himself the powerrelation in which he simultaneously plays both roles; he becomesthe principle of his own subjection.
The panopticon works as a system of social control even without someone in the guardhouse. It is being seeable, rather than being seen, which makes it effective.
I don't understand what Foucault says here.