The factory produced nothing visible. The conveyor belts ran in closed loops, each loaded with identical boxes labeled in two colors: red for THREAT, blue for PROTECTION. At the end of the circuit the boxes were opened and inside each one was the other. Threat contained protection, protection contained threat, and the chain never stopped because each opening justified the next.
I walked along the belt looking for the first box, the one that started it all, but the numbers on the labels were circular: each pointed to the previous one and the previous one didn’t exist.