The bench surface is very flat, there are no burrs, no edges and corners, and the tentacles are smooth and traceless, Zhu Gantang did not suspect that this was not a whole at first.

But now he turned the stool over and saw its surface, and immediately realized that something was wrong.

There was a painting on the bench.

Winding green mountains, continuous green water, a mountain road slanting upward, walking a woodcutter carrying a burden. There is a flat boat by the river, and I don't know where the fisherman has gone.

This painting is neither carved nor painted, how did it come about?

Zhu Gantang studied it repeatedly, pondered it carefully, and finally saw it after watching it for a long time - this is made of wooden strips!

Paulownia wood has a characteristic that its grain is very clear, which gives its wood itself a specific beauty.

However, the grain of the wood is quite monolithic, usually in the same direction, which is too regular and difficult to form a picture.

The candidate saws the wood in his hand into sticks, selects a part of it and splices it, using its own texture to form a picture.

After knowing this, if you look closely, you can vaguely see that the direction of the wood grain is indeed naturally generated.

That's a lot more difficult......

First, candidates are required to have abundant imagination and a high degree of aesthetics, so as to put together such original materials into a landscape painting with excellent artistic conception.

Second, candidates are required to have superb basic skills in order to make logs into a large number of smooth and symmetrical wooden strips in a very short period of time for splicing.

The third point, and the biggest problem, is how to put together these wooden strips to achieve such a smooth and traceless point? And what kind of technical means are used to achieve this piece of woodwork?

Zhu Gantang knew very well that there was no such thing as fish fat glue for adhesion filling in the tools provided today.

This is actually another hint in addition to words. Without glue, how else can we connect timber structures to each other?

Only mortise and tenon!

But without glue, how do these strips of wood come together?

Or mortise and tenon?

It doesn't look like it......

Zhu Gantang pondered for a long time, but still didn't see how the surface of this wooden stool was made.

He thought for a moment, finally stood up, turned to Song Qin and the two masters, and said, "You two, please stop what you are doing for a while and come over and have a look." ”

Both of them stopped at the same time, stood up and walked over.

"What?" Master Qin asked, looking at the things on his table.

Obviously, Zhu Gantang called them over for this.

As soon as his gaze fell, he let out a soft "huh".

"This stool looks kind of interesting. He said as he picked it up and looked at it.

When he said this, Zhu Gantang also felt a little interesting. Because when he put it on the table just now, the stool surface was facing inward, so he couldn't see the stool surface when he looked at it directly. And now when Master Qin picks it up, it's not the stool surface either—what else is wrong with it?

Master Qin held the foot of his stool and muttered, "The outer circle and the inner square are quite stylish, and there is this size arrangement......"

He frowned, a little uncertain, and finally asked Master Song: "Why do I think something is wrong, it seems to be a little better than other stools?"

Master Song also frowned, his eyes fixed on the leg of the stool. After a while, he spit out four words: "The number of great yan." ”

Master Qin's eyes widened when he landed, and his face was full of surprise.

"The number of Dayan?" Zhu Gantang also looked surprised.

"The number of Dayan is fifty, and there are nine out of forty. Zhu Gantang muttered. This is a sentence in "Zhou Yi Zhi Ci", ordinary readers may not have read it, how do these craftsmen know? Also, what does this legendary number of great Yan have to do with the wooden bench in front of him?

"The number of Dayan was used at the earliest, and according to legend, when the Great Yu Lord began to flood. In our craftsmen, this is a way of dividing the line, according to which the most pleasing and reasonable proportions can be achieved. Legend has it that the number of the Great Yan is about four or six, but there is a more detailed degree. How much has been lost. ”

Master Qin stared at the wooden bench and explained to Zhu Gantang. Finally, he gestured with his hand, and said with great certainty, "That's right, this stool is a big man!" Look, my lord, do you think that this stool is very pleasing to the eye at first glance, and it is very different from the others?"

That's right, before noticing the stool, this ordinary square stool had already attracted Zhu Gantang's attention, making him feel that it was different from the others, as if it was more pleasing to the eye.

In fact, is this because it contains such a mystery?

"Is it possible to measure this stool with a ruler and get the number of the great scale?" he asked with interest.

"It stands to reason that this is the case, but ......" Song Qin's two masters showed hesitant expressions at the same time.

"How?"

"The number of Great Yan has long been lost, and it will appear here today, most of which master's family inheritance is a secret inheritance, and it has been used indiscriminately by an unconscious apprentice. According to the rules, we are not allowed to study this kind of ......" Master Qin gritted his teeth and explained to Zhu Gantang.

"Haha, the two masters are too worried. If that master knew that his family inheritance was taken by the emperor, not only would he not be stingy, but he might also praise his apprentice. Zhu Gantang didn't care, stroked his palm and smiled.

Hearing this, Song Qin and the two masters could only look at each other and smile bitterly. At this time, they must not be able to say categorically, they will definitely not be happy, who wants to contribute such a thing as a family inheritance?

However, the number of great extensions is often hidden in complex works, and it is difficult to be explored. It was the first time they had seen it simply used on a wooden bench. Isn't this just like Zhu Gantang said, you can know by measuring it a little?

The so-called number of great rays is actually the golden ratio ratio.

0.618, in Xu Wen's time, was a number that even a slightly smarter elementary school student could casually say.

This number is mentioned in both Zhou Yi and Hetuluo's books, which shows that the ancient Chinese were not without research. But it is so vaguely expressed that most of the scholars are seriously literal and rational, and the vast majority of craftsmen have never read books. So before you know it, what has been there for a long time is gradually disappearing.

But the feeling of beauty is always the same, and there is such a proportion that has always been passed down and has become a legend among craftsmen.

Zhu Gantang called the two masters over just for the stool, but he didn't expect to know the application of Dayan in it, and his interest suddenly became even stronger.

He stopped selling the stool, and turned the stool over and showed them the stool.

"I can see that this bench surface is made of paulownia wood texture, with countless wooden strips spliced into a shape. It's just that how it is connected, you have to consult the two masters. ”

The two masters were shocked again.

They just took this stool to study the number of Dayan for a long time, but they didn't find out that the stool was spelled out!

You must know that their hands, but they have been trained for many years, and they are much more sensitive than Zhu Gantang. Even they didn't figure it out, this craft is really a bit powerful.

"This landscape map...... That's a good fight. Master Song stretched out his hand and stroked it for a while, and then brought it to his eyes to take a closer look.

"This paulownia wood material is not very good. After a moment, he said with great certainty.

"If the materials are not good, can it be made like this?" Zhu Gantang was surprised.

"It was because of the bad materials that he deliberately did this. This is a vain with a clever mind. The hollow part of the paulownia wood he was assigned to was mostly larger, and the materials available for leaving it became smaller, and it was difficult to save a complete bench surface. It's not good to spell directly, so he thought of such a way. ”

It is rare for Master Song to say such a large paragraph, and his words are full of appreciation.

"Yes, that's a clever idea. There is also the spelling of this wooden strip...... "Master Qin also came to the front and looked at it for a long time, and his eyes widened instantly, "Mortise and tenon!"

"Yes, it's all mortise and tenon. Master Song agreed with his judgment.

Today, these two words were repeated in Zhu Gantang's ears for a day, and the common mortise and tenon structure was almost read. There were several other structures that he had never heard of before.

He thought that he had taken this as an ordinary thing, but at this time, he was still shocked: "The mortise and tenon joint is spelled out?