Elias Green stood in the London docks. It was . He had a piece of paper in his left hand. The paper was a manifest for a shipment of English Oak. The paper was signed by a clerk. The clerk worked in an office in the city.
The clerk had never seen an Oak tree. The clerk knew the price of Oak. He knew the volume of Oak. He did not know the wood. Elias Green looked at the logs on the deck. He saw the way the bark peeled. He saw the color of the sapwood.
He knew the logs would fail if they were used for the ribs of a ship. The manifest said the timber was Oak. The manifest was a legal truth. The timber was a physical lie. Elias Green rejected the shipment. The clerk in the city was angry. The clerk thought the name on the paper was enough.
The Name is Only a Label
A specification is a piece of paper. It is like the manifest from . It contains words. It contains numbers. It names a species of hardwood. It names a grade. The person who writes the specification often believes the matter is settled.
They believe the word “Iroko” or “Oak” describes the material completely. It does not. The name is a label for the market. The label makes the wood tradeable. The label allows the buyer to compare prices. But the joiner knows the name is only the beginning. The joiner knows the wood has habits. The wood moves. The wood breathes. The wood has a history before it reaches the workshop.
I sent an email this morning. I wrote a long explanation. I hit the send button. I realized two minutes later that I had not attached the file. The email had the name of the file in the text. The email had my signature. The email was empty of the thing that mattered.
A specification is often like that email. It has the name of the wood. It does not have the reality of the wood. The reality is what determines if a bench in a public square lasts for or if it fails in .
Reality #1: The Growth Environment
The first reality is the species name itself. A name is a category. It is not an individual. Two trees of the same species are not the same material. One tree grew on a north-facing slope in a forest with many neighbors. This tree grew slowly. The rings are tight. The wood is dense.
Slow Growth (Stable)
Fast Growth (Soft)
Same species, different density. The slow-grown wood (left) holds bolts where the fast-grown wood (right) lets them pull free.
Another tree grew in an open field. This tree grew fast. The rings are wide. The wood is soft. The specification calls both trees by the same name. The buyer pays the same price. The joiner sees the difference. He knows the slow-grown wood will hold a bolt. He knows the fast-grown wood will let the bolt pull free when the wind blows.
Reality #2: The Sponge (Moisture)
The second reality is moisture. Wood is a sponge. It holds water in the cell walls. It holds water between the cells. When wood is cut, it begins to dry. The wood shrinks as it dries. A specification might say “kiln-dried.” This is a number on a gauge.
It does not account for the air in a park in Marseille. The air in the park is different from the air in the kiln. The wood will adjust. It will gain moisture in the winter. It will lose moisture in the summer. If the bench is built too tight, the wood will expand and break the frame. If the bench is built too loose, the slats will rattle. The joiner builds for the movement. He does not build for the specification.
Reality #3: Grain Orientation
The third reality is the grain orientation. The grain is the direction of the fibers. You can cut a plank so the rings are flat. You can cut a plank so the rings are vertical. The specification rarely says which way to cut. Flat-sawn wood is cheaper. It is also more likely to cup.
When the sun hits flat-sawn wood, the edges lift. The bench becomes a shallow bowl. It holds water. The water rots the wood. A joiner prefers quarter-sawn wood. The rings are vertical. The wood stays flat. The specification ignores this. The specification looks at the cost per cubic meter.
“The name of the material tells me what the owner paid for, but the burn pattern tells me what the material actually was.”
– Hayden J.-C., Fire Cause Investigator
This is true for furniture in a city. The sun is a slow fire. It breaks the bonds in the wood. It turns the wood grey. It creates small cracks called checks. A specification names the wood but it does not name the sun. The joiner knows how to orient the grain to minimize the checks. He knows where to place the heartwood.
Reality #4: Heartwood vs. Sapwood
The fourth reality is the difference between heartwood and sapwood. The heartwood is the center of the tree. It is dead. It is filled with tannins and oils. It resists rot. The sapwood is the outer layer. It is where the tree moves water. It is full of sugars.
Center: Heartwood
Rich in tannins. Decades of durability. Resists fungus.
Outer: Sapwood
Full of sugars. Rots in . Insects love it.
Insects like sapwood. Fungus likes sapwood. A specification often forgets to exclude sapwood. A bench made of Oak sapwood will rot in . A bench made of Oak heartwood will last for decades. The name “Oak” covers both. The joiner knows he must throw the sapwood away. He knows it is a waste of money to use it.
Reality #5: The Geometry of the Joint
A specification might call for a specific bolt. It might call for a stainless steel bracket. It does not describe the way the wood meets the metal. Wood is acidic. Some woods react with metal. They create black stains. They corrode the bolts.
The joiner knows which metals to use. He knows that a mortise and tenon joint needs room to breathe. He knows that a screw driven into the end grain has no strength. The specification treats the bench as a static object. The joiner treats the bench as a machine with moving parts.
Reality #6: The Maintenance Cycle
The sixth reality is the maintenance cycle. A name in a catalogue suggests a finished product. It suggests a thing that is done. Nothing in a public park is ever done. The wood requires care. It requires cleaning. It requires the occasional tightening of a nut.
The specification focuses on the purchase. It does not focus on the of life that follow.
durable outdoor furniture solutions by Bio Jardins
are selected because the makers understand these cycles.
They choose models like the AGORA or the CANVAS because the design acknowledges the wood will change. They choose makers who know the wood will move.
Reality #7: Growth Environment & Weight
The seventh reality is the growth environment. Wood from a managed forest is different from wood from a primary forest. The density of the wood changes the way it takes a finish. The density changes the weight. A specification does not describe the weight.
A person installing a bench needs to know the weight. A person sitting on a bench feels the weight. A heavy bench feels permanent. A light bench feels like a mistake.
When the benches arrived, . They looked like spoons. They were uncomfortable. They were a failure. I had the name of the wood right. I had the physical reality wrong. It was like my email today. I had the words. I did not have the substance.
The Invisible Knowledge
Markets like names because names are easy to count. You can put a name in a spreadsheet. You can multiply a name by a quantity. You can arrive at a total. This is how cities are built. But cities are made of materials, not names.
A material is a living thing. It has a cellular structure. It reacts to the humidity. It reacts to the touch of a human hand. The craftsman is the person who translates the name into a reality. He is the person who looks at the plank and sees the tree.
When a city department chooses a bench, they are buying more than wood. They are buying the knowledge of the person who built it. They are buying the decision to reject the sapwood. They are buying the choice to use quarter-sawn slats.
This knowledge is invisible in the specification. It is invisible in the invoice. It only becomes visible after of rain and sun. The bench that is still straight and strong is the bench where the joiner ignored the name and looked at the wood.
Designing for Reality
This is the difference between a specification and a design. We should spend less time on the names of things. We should spend more time on the habits of things. A name is a shortcut. It saves time in the office. It costs time in the field.
Elias Green knew this in . He knew that the name Oak did not keep a ship afloat. The wood kept the ship afloat. He looked at the grain. He looked at the knots. He used his hands. We have better tools now. We have computers. We have global logistics.
But the wood has not changed. It still drinks water. It still moves in the sun. It still needs a joiner who knows its name is only a label.