There’s no doorbell at this address, just a lock and a sign, the sign superimposed on a previous sign whose directions apparently weren’t sufficient. The newer sign — which is by no means new, the black words nearly merging with the blue tape on which they were written by hand — reads “Knock On Roll-Up Door.” The roll-up door is the door to the right of this door. It’s massive, double wide and double high. Even in a light breeze, the roll-up door’s corrugated metal faÃ§ade bangs against the rollers and tracks. Presumably if you live or work here, you can tell nature’s knock from that of a visitor.An ongoing series cross-posted from instagram.com/dsqt.