Because the silence whose archaeology is to be undertaken is not an original muteness or nondiscourse, but a subsequent silence, a dis course arrested by command, the issue is therefore to reach the origin of the protectionism imposed by a reason that insists upon being sheltered, and that also insists upon providing itself with protective barriers against madness, thereby making itself into a barrier against madness; and to reach this origin from within a logos of free trade, that is, from within a logos that preceded the split of reason and madness, a logos which within itself permitted dialogue between what were later called reason and madness (unreason), permitted their free circulation and exchange, just as the medieval city permitted the free circulation of the mad within itself