Late 1800s–early 1900s archival photography, albumen or early silver print. Sepia or faded grayscale tones. Shot on a large-format field camera with shallow depth falloff, slight long-exposure softness, and natural lighting only. Subtle lens imperfections, slight motion blur on figures. Heavy print aging including scratches, dust specks, chemical stains, faded edges. Flat observational documentary framing, slightly off-center. No modern materials, no electric lighting. Everything appears physically real and officially documented. Late 1800s archival photograph, sepia, dust and wear. An aged archival photograph showing a corridor on the fourth floor with all doors sealed. No signs of use or entry are visible.