edit only the backing panels of the bookcase in the supplied image add solid walnut backing to every open compartment where the pale room wall is currently visible match the existing dark matte american walnut exactly in colour grain scale texture and finish position all new backing panels at the rear of the compartments maintaining their full depth keep all existing walnut backing panels unchanged preserve the exact construction doubled side panels projecting edges shelves drawers books and accessories keep the existing lighting exactly as shown do not add led strips or illumination to the newly backed compartments everything else must remain identical room floor glazing camera angle perspective framing aspect ratio and exposure change only the backing so that every open compartment has a solid walnut back
