“Stone walls do not a prison make / Nor iron bars a cage.” Occupying the director’s chair for the second time, Gregor Centner crafts a delicately empathetic cine-essay on a middle-agedprison inmate dealing with life first “Inside” then “outside.” Scrupu/ously withholding Wolfgangs identity, Centner nev­ertheless brings his personality to three-di­mensional life in this absorbing work of clear-eyed humanism and“ Neal Young VIS