Brick Graffiti – 1929 Carvings on the back of a barracks building. Similar Images ...based on the tags: brick-graffiti, brickwork, brown, notes-to-self, numbers, worker-graffiti... Some sort of materials handling building, judging by the construction. In the barracks. “N.L. ’45”. Brick Graffiti Series. If you know what BTI stands for, please leave a comment. Part of the 1917 mill that had a little bit of roof left over it–most of this building was open to the sky. The birds loved it, but everything metal was quickly becoming too unstable to walk on. Beside the shaft building are two fans on skids, indicating they were used underground. The old No Trespassing sign, with the Peavey logo still on it. A little welding art one crosses over near the windlass room. In the grungy control room, I found a little slice that was never graffitied.