Low-clearance board-formed reinforced-concrete soffit or beam in the vault-adjacent circulation space at the Hoffmann-Hayman factory, photographed 5 October 2014 (Sony DSC-RX100) — horizontal wood-plank formwork grain pressed into the grey-beige concrete face, with the two-line hand lettering 'WATCH YOUR' / 'HEAD' applied in dark charcoal or grease stick; a thin copper wire hangs vertically through the field and a black horizontal pipe crosses the bottom edge, reading as a practical head-strike warning in tight quarters above the vault
