" But a punishment like forced labour or even imprisonment – mere loss of liberty – has never functioned without a certain additional element of punishment that certainly concerns the body itself: rationing of food, sexual deprivation, corporal punishment, solitary confinement … There remains, therefore, a trace of ‘torture’ in the modern mechanisms of criminal justice – a trace that has not been entirely overcome, but which is enveloped, increasingly, by the non-corporal nature of the penal system "

― Michel Foucault , Discipline and Punish: The Birth of the Prison