I would bet it was part of the repair phase. As cool as the joinery is, it would be a strange thing to do during original construction, but an elegant way to fix a broken post.

The whole forbidden city in Beijing was built with with these skills 600 years ago. And these are traditional Chinese woodworking skills. Not Japanese

​@@goldenn1086 So you're saying the Japanese, Who had cultural, economic, and political interactions with the Chinese for more than 1500 years, May have learned skills and techniques from the Chinese sometime in the 1000 Years prior to building this? No Sh*t Sherlock. Japanese have been building Buildings in Japan since before 1100, as I'm sure China did as well. Japanese craftsmen building Japanese buildings don't have to credit the skills the Chinese may have shared hundreds of years prior. The trade went both ways.

@@goldenn1086 Prove it !! Is there any drawing or photo?

*So you're basically saying we've no idea when or by whom this joint was first used?*

Excuseme 🤝🙏

それが宗教観みたいなところある。

Cheers! Indeed, the work they did were really special!

👏👏👏

I doubt it. By looking at the outline of the joints, you can immediately deduce how it looks pn the inside, because the two pieces only move in a straight line in order to close the joint. All you need to do is draw straight lines from the outline and figure the direction.

@@xl000 You don't know what you don't know. It's not that simple. Now that You've seen this video it looks easy but looking from outside it's almost impossible to know how the internal sections interlock. The first person who came up with this idea was a genius. Not in wood working but in geometry.

@@xl000 That's an incredibly glib response. Try not to be so smug, it's not winning you any friends.

本当にそうですよね　特に鑿の美しさには感動しました

大工さんに限らず、機械関係とかでも、施工者の道具や、工具箱はその職人さんのレベルを映すものだと思っています。

手入れが行き届いてて使い古された道具も味があっていいよね

@@user-nf8yw3wz4g 機械使わなきゃ分からないレベルのやつを機械なんか使わずに頭で考えてた訳だから先人がつよい(？)

@@rei34057 機械使って調べた時点で現代人がギブアップした感ありますね。

こういうのは未来に遺さにゃいかん

Hii friend,, check my vdeo 🙏😊

Happy to hear that, thank you 😊

这种工艺叫 榫卯 来源于中国 是我们鲁班大师所创造的 被日本学去并发扬 中国的古建筑不需要任何钉子 日本的榫卯只是皮毛

There is one of Miyadaiku company called Kongo Gumi which is oldest company in the world. Set up around 1500 years ago for maintaining temple called Horyu Gi in Nara. More than 20 companies are more than 1000 years old and 20,000 companies are old as 100 years old in Japan.

This is basic stuff. Almost every nation (and certanly every civilization) built a lot of huge things from wood without nails. Hell, my two story house has only 36 nails, 6 nails per door.

@@user-pm8je4fo7e This is great stuff. Almost every nation (and certanly every civilization) built a lot of huge things from wood without nails and it's great to see traditions kept alive. I'm totally with it too, my two story house has only 36 nails, 6 nails per door. Keep up the good posts teaching next generations the skill and pride you get from simple tools, knowledge and time.

Ya, because they stole this technique from China

Actually, an axial (downward) force will not bring the two pieces together. The force must have both a transversal and an axial component, and this is the reason why the X-ray visualization was needed, this is a lot more complex than it looks. What is incredible in many of these joints is that the Japanese carpenters managed to figure them out without the aid of descriptive geometry, the branch of math that modern CAD system use.

@@skwalka6372 I understand what you mean with the transversal + axial force. HOWEVER (he argued with the actual knowledgeable person ;))... In the video it seems like only 'axial force' is applied (by hammering). And the shape of the joint seems to facilitate the 'transversal' movement (or eh.. 'The geometry of the joint converts the axial force into transversal force' or something similarly scientific sounding). Because he's hammering on axis. (And that causes the piece to slide diagonally into the other piece) Unless I'm getting something completely wrong, I think my original description might be accurate still.. (?) (Though most likely I was using the wrong terminology.. Still feels accurate to me; downward force pushes the joint together.. Albeit by converting part of that force into diagonal force). - As for your amazement; that's what I love too. This is all without fancy tools and computers :) What I think might have been part of the process of designing these, is something like Escher did with his repeating patterns, that morph from one shape into another as the pattern goes on. The basis of designing those, was simply "taking a square, then take away a bite out of one side, then stick that bite on the other side". And then continuing until you get a complex shape that is able to tile perfectly. Seems to me like a logical way to arrive at certain complex joints. (But I could very well be wrong, of course. Just thought I'd share my thoughts on that :)) Also, thanks for the terminology update: 'descriptive geometry'. I've never gotten into CAD, but I feel like it's something that could be benefitial. (I know my way around Illustrator, and I've done some mild 3D animation years ago (in cinema 4D I think). CAD seems like something cooler, though. Since you can basically design things that can be made into actual objects, instead of things on your screen or on paper. Dumb question; 3D printing... Is that done with CAD too..? (Or 'something similar but not CAD'). Never got the chance to do anything with that yet. No idea where to start (:

@@iggysixx The last few seconds of the video as he assembles the joint shows the joint being closed with axial hammer blows. However, most of the assembly (look at time about 6:10 on) is done without hammering. The reason is that when the assembly begins, axial hammering would cause friction forces to slightly deform the joint surface, making the closing movement hard or impossible. At the start of the assembly, he is holding the upper component with his hand(s) and pushing it laterally, supplying the lateral force component I mentioned. When the joint is almost closed, the bearing surfaces are larger and you can proceed with the hammer. Descriptive geometry (an advanced version of it) gives you the math infrastructure to calculate these shapes, 3D printing uses it as do all the computer functions you use in animation.

@@skwalka6372 A belated 'thank you' for the extra schooling session :) It's actually very helpful to understand the terminology of mechanics a little better, as well as gain some insight into how stuff works. Last question; Once the joint is seated properly / has been fully hammered in place... And it's holding up a roof or something.. From that point on, it would be true to say that the 'axial force' / downward force will at least 'keep it in place', right? (Since it would require upward + sideways force fo get it apart again)

@@iggysixx If done correctly (meaning the tolerances are right), this joint should be self-centering and self-tightening once it is assembled. No need to apply any additional forces to keep in place. It will resist both tensile and compressive forces as well as rotational torque. Whoever invented this joint was an extremely clever person. =)

よく言ったね先生 -- by Google ✌🏼

👏👏👏

それは私も知りたい非常に良い質問です。

This is a woodworking technology invented in China. It was used as early as 7000 years ago and was introduced into Japan later

@@chandlerbing3290 凄いね。チャイナでは石器時代に、こんな複雑な木の加工が出来たんだ。

I don't think there was a country called South Korea at that time.

簡素なAという細工職人なら誰でも思いつく接続方法に対してその欠点をBで補う。そのAとBを同時採用するためにCという方法を導入する。 それだけです。 逆説的には その方法があり、現場や木の特性、負荷の方向からそのCが採用される事になりますね。 負荷メインが縦のみだからA接続にしよう、ならばBでCだ。ともなりますし、現場でC方法で接続していきたい、となればCの接続方法を採用するには噛み合わせはBとAでどうじゃろ。 となります。

You conceive it when you have absence of insignificant stimulus. Today we are bombarded with all kind of crap, whole day.

It's called "spatial awareness" - the ability to hold a scene in your head and rotate it around to "see" it at different angles and orientations - Men, who as hunters needed this for humans to survive, typically are better at this than women, we are simply "built for it". Similar to men having larger lungs so they can run for longer, it's just a genetic tool for our survival as a species. Fast forward 2 million years to today, we still have this and it proves itself in spades with modern trades and engineering. I daresay, without it, we'd still be filthy animals roaming the savannas of Africa - if we survived at all as a species.

"Kündekari" sanatına bak

今の文化財修復ってオリジナルと完璧に同化させるように仕上げるんじゃなくてあえて修復箇所がわかるようにしてるよ。理由は数十年後の再修復のためだったり、今残ってるオリジナルの箇所をできるだけ尊重するために

Great to hear that, cheers! 😊🙌

I tried it once and I understood right away that gluing is my talent. Good Lord it needs enormous precision and a steady hand. It's amazing though

"Kündekari" sanatına bak

Necessary in a land riddled by earthquakes

That is great to hear. Thank you for your kind comment 😊

Doesn't do too well in earthquakes though.

The Japanese kind.

A bored monk.

People with good education And probably with different iterations of the joinery

People woth no social media or television serving as a constant distraction 😄 Try sitting at home and only looking at a spot at the wall for an hour without a tv or music playing and your mind starts to do crazy things. Basically a form of meditation

Oh come on. What's with these replies. [Smartass mode activate] A carpenter? 😁

Hello friend 😊👍

I, Nephi, having been born of goodly parents, therefore I was taught somewhat in all the learning of my father; and having seen many afflictions in the course of my days, nevertheless, having been highly favored of the Lord in all my days; yea, having had a great knowledge of the goodness and the mysteries of God, therefore I make a record of my proceedings in my days. Yea, I make a record in the language of my father, which consists of the learning of the Jews and the language of the Egyptians. And I know that the record which I make is true; and I make it with mine own hand; and I make it according to my knowledge". 1 Nephi 1-3 Hello friends, I am a member of The Church of Jesus Christ of Latter-Day Saints. The verses above are the first three verses in The Book of Mormon. I know this probably isn't the most ideal place to talk about religion but I really do want you to know that God loves you. You may not love Him or care about Him at all, but He still will continue to love you. You are a beloved son or daughter of God. He knows you personally and He truly and deeply desires for your happiness. He loves everyone who has every lived on this earth, with a perfect equal love regardless of their race, gender, ethnicity, faith and values and beliefs. The Lord loves you more than you can think or comprehend. "He inviteth them all to come unto him and partake of his goodness; and he denieth none that come unto him, black and white, bond and free, male and female; and he remembereth the heathen; and all are alike unto God, both Jew and Gentile" 2 Nephi. He is our loving Heavenly Father. We are literally His children and creations. When we were in the womb, he knew about us" Jerimiah 4:5. He knitted us and we were created in His image. I testify to you that you and I are not a mistake. He knows the very moment when we stand and when we sit. He is familiar with all our ways and knows us personally who we are. The hairs on our very head are numbered. God loved us so much, He sent His Only Begotten Son for us, that we may be able to return and dwell in the presence of God again. The Lord has not forgotten about us even when it feels like He has. He will never forsake us. When we are happy, He and His angels rejoice alongside us. When we are sad, He heals us and lifts us up from our trials. He has always been there for us. He has always been our loving, compassionate Heavenly Father and God. Will we always be His children and people? I testify to you that God lives and that Jesus is the Christ. Both love you exceedingly and rejoice when you are happy. They both love you so much. They love you with a love unfeigned. They will never ever stop doing good unto you. I know that The Book of Mormon is true. "And when ye shall receive these things, I would exhort you that ye would ask God, the Eternal Father, in the name of Christ, if these things are not true; and if ye shall ask with a sincere heart, with real intent, having faith in Christ, he will manifest the truth of it unto you, by the power of the Holy Ghost". Moroni 10:4 I promise and testify to you, that if you will read The Book of Mormon, ponder on its message and ask God if it is not true, you will come to know of its truthfulness, whether its true or not true. Remember my friends that God loves you with all his heart, might mind, soul and strength. He wants you to be happy. He knows what you are going through and dealing with right now. He desires for you to return back to Him. Unfortunately, He has been misrepresented and seen as a cruel and angry God who anticipates for us to slip and writes down every mistake we make waiting to punish us by those who do not know or know Him fully. My friends, God has stored many opportunities and blessings for you. He is incredibly eager and desires with all His heart to bless you abundantly. He wants you to live with Him again. He wants to experience everlasting joy and indescribable happiness in this life and in the life to come. He wants you to partake of His goodness and come and follow Him. The Lord does not care how early or late you decide to come unto Him. I testify to you that if you have strayed and wondered off the path that there is hope in Jesus Christ, The Savior of the world. The Lord accepts those who come unto Him whether your early, late or just in time who desire to change. The Lord will accept you wholeheartedly and forgive you if you are willing to change. The Lord will welcome you and will always be ready to embrace you with open arms. The Lord will lift us up in our trials and use us to bless the lives of those around us if we are willing to change. If you desire to learn more, you are always welcome to visit comeuntochrist.org. There you will learn more about The Church of Jesus Christ and our core beliefs and values. If you have taken the time to read The Book of Mormon and this comment, thank you. It takes a huge leap of faith and a lot of courage to muster enough faith to read in the Book of Mormon and to believe in something in a personage that you may never see in this lifetime. Although we may not be able to see God and Jesus Christ in this life, I testify to you that they are real. They do truly exist. I promise you that if you will pray to know of their existence, you will come to know whether they exist or have been made up. Remember that The Lord is always available to talk to through prayer 24/7. No question sounds too silly for Him. James wrote, "If any of you lack wisdom, let him ask of God, that giveth to all men liberally, and upbraideth not; and it shall be given him" James 1:5. If you must know whether or not something is true or evil and deceptive, you can always pray to God. He will help you know what the truth is and what is not true. He will never be too busy to talk to. He will give you strength you need to overcome your temptations and will give you the strength you need to endure through your trials and afflictions. Paul said that The Lord will not give you temptations that you cannot resist, but that in your temptations, He will provide a way for you to resist and overcome them. He will provide a way. He wants to bless you and reward you abundantly. The Lord knows you and will not forget you. You are loved. You are utterly amazing. You have incredible potential. You are not forgotten or ever will be forsaken. You are special. You are unique. You have been reserved for this time and The Lord needs you on His side. It simply would not be the same without you. Thank you for your time.

The company called Kongo Gumi is around 1500 years old. This company was set up for maintaining the Horyu Ji Temple in Nara Japan. This company is carrying those skills upto this day. More than 20 companies are like this companies older than 1200 years old and 20,000 companies are older than hundreds years old in Japan.

This technique was invented much earlier than 400 years ago, and it was spread from China to other Asian countries including Japan. The usage of this technique in ancient Chinese furnitures and architectures was on the next level but it’s sad people hardly know about it and have no opportunity to see real fascinating ancient techniques.

Japanese invented it? It's invented in China thousands of years ago.

Thank you 😊

*crafts people

One measure of durability of Japanese style carpentry is that there are buildings in Japan, made entirely with wood to wood joinery, that have been standing for over a thousand years. How many houses in a modern subdivision, built with modern materials like OSB, rigid foam, zip sheathing, screws, nails... will still be standing in 1,000 years? This particular joint may not be as strong as welded steel, but wood joinery is an incredibly durable way to build.

Don't they have a lot of earthquakes in Japan. Perhaps these joints allow for movement. Just saying...

Happy to hear that 😊

いくらかかるかなんて考えたらいけない。 きっと目ん玉飛び出る金額になって思わず声が出ちゃうよ。 ひよぉ～って (｀・ω・´)ｷﾘｯ

中国的榫卯结构（Chinese Mortise and tenon）

I imagine the purpose behind the joints is to keep the posts together during an earthquake. Could be wrong though.

@@Ratnoseterry no, this technique was developed long long long ago, because back in the days iron nail do not exist/ too expensive.

Cheers! 😊🙌

I did not think it impossible. But the construction would have to be with a sliding movement that I simply could not imagine. I think I now know a little about how we might look to an insect or other small animal: Beyond their grasp. Impressive!

Cheers 😊🙌

Cheers! 😊🙌

在来工法では普通にあるよ ただ今は工場で刻んでくるけどね ２５年前に手伝いに行った現場 増築部分誰もできなくて 俺が墨付けして建てました その頃から墨付けできる職人減ってました

榫卯结构 起源于中国 古代的鲁班发明这样的结构

谢谢，这很有趣。-- by Google ✌🏼

Therein probably lies your answer. I often wonder similarly about Mozart, Bach et al. No MIDI, no multi-channel recorders, no keyboard synths etc. The wiring of the problem solving and innovative minds that came up with such wonderful mysteries perhaps couldn't exist in these modern times. Hopefully not the case but... Cheers - Dave

This type of joint probably evolved from the combination of a couple of other joints. Still beautiful and impressive though.

Genius.

Thanks 😊

you are right. there should be a "no bullshit" filter on YT. this channel would pass for sure !

*I challenge you to name a piece of furniture that blends the aesthetic, carpentry, joinery, surface finish and ease-of-transport half as well as the IKEA Lack.*

因為日本人是中國人的好學生。

大正時代に補修した時の大工さんが組んだらしいですが。

@@user-fw3rs7pr5g 昔はこういう遊び心が あったんだよね 職人さんの手間も良かったし 俺も色々遊ばせてもらいました 大手から坪いくらで請負ってたら 手間にならないですから

Thank you 😊🙌

didn't expect to see papa Flammy here xD

ООО!!!

@@user-wf5dh4ti1w 膝専門~外来

@as as ..knock on wood..