From the Tideline｜Vol.5

Aug 12, 2026

From the Tideline Newsletter

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This newsletter is a weekly report from Takahiro Mitsui, delivered every Wednesday (JST) from his ongoing research of Japan. It brings you a perspective and a point of view you will not find elsewhere, as soon as they take shape.
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Vol.5
Aug 12, 2026
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1｜LIVING QUESTIONS
2｜JAPANESE THOUGHT
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1｜ LIVING QUESTIONS

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To keep asking in a world with no answers. Takahiro Mitsui has made asking his way of life, crossing at speed between the turbulence of the outer world and the sharpening reflection of the inner. Each week begins here, with what he is seeing now and how he sees it.
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In recent summers the children’s voices have gone from the park near my house. I walk past it and hear nothing. There is nobody there at all.

By my own reckoning the heat has been punishing for three summers, and in that short stretch people simply stopped going outside. This is the school holiday. The children are free all day. They stay in, and the hours indoors keep stacking up.

It would be easy to file this under climate change and move on. Something is happening to the climate and I am not going to pretend otherwise. But set the industrial causes aside for a moment and the picture changes, because the earth shifts and the universe shifts and there is nothing unusual in that. Before we reach for the largest explanation available, a smaller question is sitting much closer to us, and we have very nearly stopped asking it. How do we design the places where people live?

Japan is an island country and a country of earthquakes. On 28 July a magnitude 7.1 quake struck Kumamoto, the third time in ten years that the prefecture has recorded the top level on the Japanese intensity scale. A typhoon crossed from the Tokyo region westward yesterday and today, and the real season has not begun. Great earthquakes, floods, typhoons, tsunami and volcanic eruptions are ordinary here. So our ancestors worked out how to live in this place with all of it taken as given. They had to. Failing to think it through killed people. And the one idea they arrived at, the idea that organised everything else, was Ki [気].

The word came from China and Japanese put it to work in every direction. It gives us the air [空気], the weather [天気], the sense that someone is nearby [気配], a mood [気分], the vitality of a place [活気], the way a person feels [気持]. Half of those point at the atmosphere and half at the state of a human being. Japanese never divided the two.

What I want to hold onto is that the word was never split, and the term for this is non-separation. Ki is not a subject roaming about under its own will. It acts of itself, at the point where movement and stillness meet. And what generates Ki is place. Place gathers nature and human beings together without cutting between them, and it is inside that undivided relation that Ki works and produces force.

Because the language did not divide them, the making of places did not divide them either. Where air does not move through a place, my ancestors thought, the Ki of the people living there will go stagnant as well. Notice what is absent from that sentence. There is no step in which nature and human beings are first cut apart and then reconnected.

None of this stayed private or intuitive. It was applied at the scale of a capital city. Tokugawa Ieyasu (1543–1616) founded his shogunate at Edo and sited the city by the principle the Japanese call Shijin Soo [四神相応]. The land itself has to answer to the four guardian gods of ancient China. Mountains to the north, a river to the east, the sea to the south, a great road to the west. What that scheme actually calculates is how Ki moves. Do not let it pool. Stagnant Ki was thought to coarsen the lives of the people living in it and to invite disaster, and a city where Ki pooled would in time cost the Tokugawa house its authority. Because this way of thinking had taken root in Japan from ancient China, Japanese city-making could carry an older native sensibility and still become highly theorised.

A city, then, was a thought made visible. The man at the top of it was doing the design himself, using an ancient body of knowledge to do it. And the same reasoning runs without a break from the scale of the capital down into the inside of a single house.

Most of that fabric burned. Cities across Japan were flattened in World War II and the traces went with them. Kyoto was spared the large raids, and there the knowledge is still standing in houses that people live in.

A friend of mine grew up in a Kyoto Machiya listed as an architectural property. Visit in August and you find no cooling of any kind, and no heating either. Air moves through the house because the house was built to circulate Ki, so that even in the worst weeks of the summer, when the streets outside hold their heat well past dark, the rooms stay cool enough to sit in without thinking about it. The timber and the tatami, at the quality they were using then, surely have something to do with it too.

One house cannot make wind on its own. The Machiya is cool because the street it stands on was built on the same principle, and so was the district that street belongs to. What we lost is not a craft technique. It is the idea that air should be kept moving at the scale of a city.

It seems to me that sealing ourselves into cooled rooms is how modern people have dismantled their own lives with their own hands. Which is why the question worth asking is whether Ki is moving through this place at all. Our ancestors spent thousands of years on that single question. They did not treat nature as an enemy or as a friend. They watched, day after day, where the air came from and where it went.

It is quiet outside today. The trees in the park are moving, and there is nobody underneath them.

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2｜JAPANESE THOUGHT

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Much of what the world says about Japan misses its essence. This section ranges across Japanese history, culture, myth, belief, folklore, and philosophy to offer one seed of its wisdom.
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