Fable
The blacksmith's hammer and the blacksmith's forge
North of the city there was a blacksmith shop, and the blacksmith, Master Han, was highly skilled. He had an heirloom hammer that had been used for decades—the head was just the right weight, and the handle length fit his arm span exactly. Neighbors who came to forge iron tools all said Master Han's hammer was good. Old Han often told his apprentices: this hammer is the entire fortune of our shop.
Later the shop took a big order: forging a full set of iron fittings for a new bridge. Old Han couldn't finish alone, so he hired five apprentices and bought three new hammers. The problem came: with more hammers, who strikes which piece of iron, which piece burns on which furnace, who takes over when the iron glows red—hammers don't answer these questions. Hammers only strike; they can't run the shop.
The apprentice A Cheng came up with an idea: rearrange the shop into a feeding area, a heating area, a hammering area, and an inspection area, and hang a small wooden tag on each piece of iron as it enters the shop to record its status. The hammers were still the same hammers, but the shop was no longer the same shop—it could handle ten pieces of iron at once without them colliding, and it could know which piece had been hammered well and which still needed a few more strikes.
Old Han initially thought all this fancy stuff was getting in the way of blacksmithing. Until one time three pieces of iron were ready at the same time, two apprentices stood holding their hammers not knowing which piece to strike, and one piece cooled by the furnace before anyone noticed no one had taken it. Old Han did the math: the material cost of that one piece was enough to pay an apprentice for a month. From then on he no longer said the hammer was the shop's asset. Instead he hung the hammer back on the wall and, pointing to the layout of the whole shop, told customers: The hammer is the tool you choose to strike with; the shop is the place where you strike things into being.
Later, a customer specified a particular brand of hammer—because their craftsmen only knew how to use that brand. Old Han said no problem, just give me the hammer head specs and I'll mount it in the shop. The shop's process didn't need to change; as long as the hammer hung up and could strike, it was fine. Conversely, another customer said, your shop layout is great, but can we use our own hammers—Old Han said same thing, no problem, the shop isn't picky about hammers.
At the year-end wrap-up, Old Han carved a line at the shop entrance: the hammer is craft, the shop is business; change the hammer, not the shop, and the shop keeps running. The apprentice asked what it meant. Old Han said: one day when this hammer no longer suits you, just change to another one; but if the shop's processes are rotten, no matter how many hammers you change, you cannot forge the iron that should be forged.
Years later, an out-of-town merchant came to visit the blacksmith shop. After looking for a while, he said, you have essentially split the hammer from the shop. Old Han smiled, pointed to a rusty old hammer in the corner and said: do you see this hammer? It used to produce only five pieces of iron a day; the problem was scheduling and receiving materials — it waited longer than it struck.
Later, Old Han took on an apprentice who could not forge iron, specifically to manage shop scheduling. When others asked him what use a blacksmith shop had for someone who could not forge iron, Old Han answered: people who can forge iron manage the hammer, people who can manage the shop manage how to forge—what I lack is not a hammer, but someone to tell me which piece the three hammers and five apprentices should strike first today.