Fable
The people who draw blueprints and the people who lead apprentices in the work
East of the city there was a bronze workshop that took an urgent order: twelve matching bronze pieces to be forged within a week. The master split the work into two parts: the first half went to Old Zhou—he only drew the diagrams, marking all dimensions, interfaces, and fitting methods on paper; the second half went to Old Ma—he took three apprentices to the back yard to fire the furnace, melt the copper, cast, and polish.
Old Zhou spent three days drawing the blueprints. Each sheet was spotless, dimensions marked to the millimeter, with how the joints interlocked and how the curves transitioned all written along the edges. The client flipped through them three times and could find no fault, nodding in approval. Old Ma took the blueprints and led his apprentice into the back yard, lit the furnace, and got to work. The first two pieces poured smoothly, but the third got stuck: according to the blueprints, the joints of the two vessels were to be cast right next to each other, but molten bronze expands with heat and contracts with cold—when the first-poured piece cooled, it pressed against the second-poured piece, and the mold cracked outright.
Old Ma ran to the front yard to find Old Zhou and put the cracked mould on the table: "Your drawing doesn't specify the casting sequence, I can't start in the back yard." Old Zhou put down his pen and looked at the crack for a long time, then said: "I calculated the dimensions three times, they can't be wrong. Could it be you didn't control the furnace temperature?" The two argued from the front yard to the back yard, and work stopped for a whole afternoon.
After dark, Old Zhou did not leave. He crouched in the back courtyard watching Old Ma pour the remaining molten copper, then watched the apprentices break the molds, polish, and assemble. The speed at which the molten copper flowed in the mold, the tiny gap left after cooling, the sequence needed when joining two pieces—these things he had never considered while drawing.
Old Zhou did not sleep that night and redrew every blueprint. Beside each drawing he added a small line: "Casting order is set by Old Ma." The next day, Old Ma saw the new blueprints and also changed the rules in the back yard: finish drawing one piece before opening the mold for the next, no longer opening a pile at once and casting them simultaneously. The remaining nine pieces were completed in one smooth run, with none stuck and none cracked.
The workshop later grew larger, but Old Zhou still focused on drawing plans, and Old Ma still focused on leading apprentices in the work. A new apprentice asked the owner: "Which of them is actually in charge?" The owner said: "Old Zhou is responsible for whether the drawings are correct; Old Ma is responsible for whether the things can be built. Offend neither."
Later someone told the story of Old Zhou and Old Ma to other workshops. After hearing it, the other workshop owners said one thing: the person drawing the plans has the whole picture in hand, and the person doing the work has the site underfoot—take away either one, and nothing gets built.