Fable
A city gate order and a yellow gate drawn inside the city gate order
The Great Zhou dynasty issued a city gate ordinance. The ordinance divided incoming goods into several categories: tea and cloth went through the green gate; medicinal materials, iron tools, and gunpowder went through the yellow gate; weapons and military horses went through the red gate; unseen new goods first went through the white gate and were temporarily held pending classification. Half a year later, the prefecture reported its achievements back to the capital, but submitted only a stack of yellow gate inspection certificates. The capital replied that the yellow gate was neatly done, but the city gate ordinance was not only the yellow gate chapter.
The neighboring county soon had an incident. A batch of unclassified new sulfur powder was treated as ordinary tea goods and went through the green gate, emitting toxic smoke in the rain. Investigation revealed that the prefectural yellow gate was inspected beautifully, but no one managed the pending process at the white gate.
The compliance officer reread the city gate decree: it governs how to classify, what documents each category must submit to enter, post-inspection recordkeeping, cross-state penalties, and annual revisions. The yellow gate is only one gate color, not the entire decree.
He assigned each city gate to a different office: the classification officer handled which gate new goods entered, the inspection officer handled yellow-gate documents, the archive officer handled evidence retention, and the patrol officer handled re-review of old classifications. Each had its own duties, but they had to be able to see one another.
Later, a new process improved an old product from the green door to the yellow door. Only then did the prefecture know that asking "Am I a yellow-door product?" could not be asked just once; when the goods, use, and manner of harm changed, the door color could change too.
Only then did the prefecture realize that the Yellow Gate was just one category of gate under close watch, not the entire city gate ordinance. If only the Yellow Gate clerks were trained, the Green Gate, White Gate, and Red Gate would all be left with gaps; if only the titles of the city gate ordinance were memorized, there would be no understanding of why the Yellow Gate needed stricter rules.
The inspector sent from the capital did not just flip through the Yellow Gate certificate. He went door by door asking: who is responsible for classification, how can cargo owners appeal, who keeps records after an incident, how is cross-state movement tracked. Only then did the prefecture complete the full set of city gate governance, rather than treating the most conspicuous Yellow Gate as everything. Later, when the prefecture trained new officials, it first explained the entire city gate ordinance, then explained why the Yellow Gate was special. New officials no longer treated priority categories as the whole law, nor did they memorize only the title of a law without knowing which gate required strict inspection.
In the annual report, the prefecture wrote more cautiously: the city gate order is a whole living framework, and the yellow gate is a category of objects subject to strict inspection. Meeting the standard for yellow gates does not mean the entire order meets the standard, and a missed inspection at a white gate can poke out just as big a hole.