... throughout the ages down to modern times, conditions of imprisonment, what with overcrowding, idleness, and all their attendant evils, have been such that not only the person but also to a deplorable extent the personality has been "confined or restrained." The problem of the betterment of our physical prison conditions goes hand in hand ... with the problem of re-creating and releasing personality "deep-dungeoned in self," of giving scope to the forces that tend upward, of counteracting and rendering harmless the already dominant tendencies toward evil.