Visibility (n.) is a trap: full light and a supervisor's eye capture better than darkness, which in the end protected.
Visibility (n.) works without anyone watching: a lit cell facing a tower that may be empty is enough, because the inmate, never sure, takes up the guard's gaze and polices himself.
Visibility (n.) can itself be political: the barbed wire, searchlights and echoing footsteps of a camp in plain sight, and the fear they spread, are policy.
Visibility (n.) changed sides: power was once what was seen while its subjects stayed in shade; disciplinary power is invisible and imposes compulsory visibility on its subjects — being always able to be seen is what holds them.