Fable
The shipwright, the inquirer, and the archive room
A carpenter's shop built an automatic water-pouring puppet for a teahouse, and next to it placed a cabinet of tea recipes. The owner managed two seemingly similar things: one was the craftsmen who built and repaired the puppet, and the other was the puppet that poured water and asked about tea for guests in the teahouse. The new apprentice found it troublesome and merged the two ledgers into one, thinking that both were related to success or failure anyway.
At first no one objected. Someone saw that the carpenter also checked the tea manual, and said the carpenter, the puppet, and the tea manual were all the same thing; the proprietor, seeing fewer pages, even praised them for saving effort. But when peak season came, the old accounts suddenly could not be explained: was it that the previous stall had not finished, or that the next stall had not held the line? No one could answer.
They first added more seals and slogans and required everyone to write in more detail. As a result, the booklet grew thicker and disputes increased. When something went wrong, everyone could find a sentence to excuse themselves, but no one knew which end to save first.
The old steward called everyone into the courtyard and had them retrace the actual course of events. Whatever concerned the immediate action went into the first book; whatever concerned subsequent responsibility went into the second. The two books referenced each other, but were no longer mixed onto the same page.
When the puppet gave the wrong answer to a guest, the shopkeeper blamed the carpenter's plane; the carpenter changed the plane, but the puppet still found the wrong tea manual. After separating them, many old conclusions changed: some work looked lively but had not actually blocked trouble; some arrangements were inconspicuous in ordinary times but preserved the whole in a disaster.
To prevent newcomers from mixing things up again, the old steward had them each handle a small case. Only when the two ledgers could each answer their own questions and also connect with each other at the boundary would the small case pass. If someone still wrote the two matters on one page, they had to return to the scene and look again at who acted first and who was ultimately responsible; when it was unclear, it was better to ask once more than let a muddled account stay overnight; because on the day something truly went wrong, one missing line of distinction would make an extra team work in vain.
Later the accounts made it clear: the craftsman is responsible for building, the puppet is responsible for serving guests, and the tea manual is responsible for finding evidence for answers. When newcomers entered the trade, the old steward had them remember just one line: the hand that builds things, the object that does the work, and the cabinet it consults each have their own boundaries.