Fable
That index card in a city's public archive that was always misplaced
In the city there was a huge pipe organ that took thirty years to tune. It could play court music and accompany weddings. Later a theater troupe invited a musician to compose for a new play and wanted the organ to produce a lighter, more streetwise tone.
The young craftsman proposed taking all the brass pipes apart and recasting them. The old craftsman frowned as soon as he heard it: there were too many brass pipes, and taking them apart once would halt performances for half a year; after recasting, the old tunes might also go out of tune. The troupe could not afford to wait, and the court would not allow him to tamper with the main instrument.
The old craftsman changed his approach. He did not touch the main copper pipe, but added small side pipes and thin valves beside several key air paths. When performing old tunes, the side pipes were closed, and the organ still had its original sound; when performing new plays, the side pipes opened slightly, and the airflow was gently rewritten at several low and high points.
The apprentice complained the changes were too few. The old craftsman had him listen to two passages: the first changed only one place, and the sound did not change enough; the second added bypasses at several interconnected positions, and although small, they brought out a whole new set of tones. The key was not the number of parts, but that these small parts, combined, could affect the main airflow.
Their first patch was incomplete. The bypass was added only in the high range, and the street style revealed palace flavor as soon as it hit the low range. The old craftsman did not dismantle the main zither; instead, he added thin valves along the few air paths that best carried the style, so the change covered the entire piece.
The bypass also has boundaries. If the troupe wants the organ to become a suona, a thin valve cannot do it; if the main instrument is already out of tune, the side pipes cannot save it. It is suitable for adding a lightweight layer of rewriting for specific pieces while preserving the foundation of the main instrument.
From then on, when changing tunes in the city, three things were asked first: whether the main zither could be frozen in place, whether a small number of bypasses could express a new style, and whether the cost of change was low enough to keep one set for each of multiple plays. The old craftsman used very few wooden pieces and bronze valves to obtain many specialized tune labels.
Later the troupe kept a separate set of bypass bridges for each new play, swapping in whichever set matched the performance. The lead zither no longer had to be repeatedly taken apart, and the plays no longer contaminated one another. Only then did the apprentice concede: a small change in a critical position can be cheap, independent and replaceable; tampering with the lead zither instead puts every tune at risk together. Later the court accepted this approach too, because the old tunes were left intact and the new plays kept their own flavor. The change was light and responsibility was clear—if something went wrong, only one bypass set had to be withdrawn. In the later review, everyone wrote this lesson into the daily rules: first see where on site the outcome actually changed, then decide what to keep, what to repair, and what to restrict.