Foucault's argument is that discipline creates "docile bodies", ideal for the new economics, politics and warfare of the modern industrial age - bodies that function in factories, ordered military regiments, and school classrooms. But, to construct docile bodies the disciplinary institutions must be able to constantly observe and record the bodies they control and ensure the internalization of the disciplinary individuality within the bodies being controlled. That is, discipline must come about without excessive force through careful observation, and molding of the bodies into the correct form through this observation. This requires a particular form of institution, exemplified, Foucault argues, by Jeremy Bentham's panopticon. This architectural model, though it was never adopted by architects according to Bentham's exact blueprint, becomes an important conceptualization of power relations for prison reformers of the 19th century, and its general principle is a recurring theme in modern prison construction.