Three forged iron window grilles galvanically copper-plated and placed in a free-standing position in which they seem to open from a pivot point. The third grille, which rests on them at the other end, in turn closes their interior. The two crooked pivots are splinted by three cylindrical clip prostheses; on the other hand, they seem to have found a hold there. - Scattered around the exhibition space, detached prostheses await new unknown tasks.