Space — A Story & Hour Cultural Series, No. 11
Round villages of rammed earth in southeast China — where a whole clan lived under one roof, facing one center, defended by walls made of soil, lime and rice paste.
Opening Scene: The Man Who Took a Sociology Lesson in a Circle
The overseas architect stood in the middle of the great hall and craned his neck back like a man watching a star fall.
Above him, four rings of wooden balconies rose one on top of another — 272 rooms, tiered like the seats of an ancient amphitheater, closing in on a patch of sky that framed exactly the top of his head. From every ring the sounds of a small town leaked downward: a knife on a chopping board, a grandmother’s scolding, a bicycle bell, rice being washed. He had flown in from Berlin to look at a “giant earth donut” he had seen in a drone video. He set his camera down on the millstone and just stood there, turning slowly.
“This isn’t an architecture class,” he told the guide at last. “This is a sociology lecture. The building is the lecture.”
His drone photograph, taken ten minutes earlier, showed a perfect ring of dark gray tiles — a fried egg, a UFO, a giant stamp on the green hills. The view from inside had nothing to do with it. From here the tulou (土楼) was not a monument; it was a family turned into masonry. The walls that held them were made of nothing more exotic than mud.
He had come to photograph a wonder. He had stepped instead into an argument about what a home is for.
The Question: Why a Circle Instead of a Street?
Every other building in the world that shelters many families arranges them along a street, a corridor, a block. The Hakka (客家) tulou of the Minxi mountains turned the whole arrangement inside out: instead of a village of separate houses facing a common lane, the lane itself disappeared, and the houses bent around into one continuous ring — no fence, no back yard, nothing between one household and the next but a shared wall and a shared sky.
Why would people build a home shaped like an embrace? What did the circle solve that the street could not? And what does a building made of soil, lime and rice paste understand about family, safety and memory that a modern apartment block has quietly forgotten?
Chapter I: The Circle Is a Decision — Kinship, Equal Rooms and the Defense of One Surname
The tulou country lies in the southwestern corner of Fujian (福建), in mountain valleys where the Hakka — migrant people who moved south over centuries, always arriving late, always settling on land nobody else wanted — built their answer to being strangers.
Read the plan and you read their fear first. A tulou is a fortress with the garrison living inside the walls. Its lowest two floors have almost no windows to the outside — the ground floor is kitchens and stores, the second is grain — and only the upper floors open narrow windows onto the hills, where lookouts once watched for bandits. The single gate is thick, iron-sheeted, shut from within. In a time when a clan’s safety was its rice and its daughters, the walls were the militia.
But fear explains only the wall. It does not explain the shape.
Inside, the circle is a radical statement of equality. In a siheyuan (四合院), the north-facing main hall outranked the east and west wings, and elders took the sun (read: The Courtyard House: A Room Built Around the Sky). In a tulou there is no north side better than another. The ring is a closed loop: every room faces the same center, the same well, the same hall, the same patch of sky. The ancestral shrine and the main hall sit not in a grander wing but at the exact center where every radius points.
The architect’s lecture had a thesis, and here it was. A circle has no head and no tail. You cannot arrange a ring into a hierarchy — every point on the circumference is equidistant from the center. The tulou was built for the one thing a migrant clan feared more than bandits: the quarrel that splits a family. The building made a certain fairness geometrically unavoidable.
They called it yī xìng yī lóu, yī lóu yī cūn (一姓一楼，一楼一村) — one surname, one building, one village. The building was the village. There was nowhere else to go.
Chapter II: Meet One Wall — Rammed Earth, Lime, and the Rice Paste That Held a Civilization Together
Now the wall itself, because the wall is the whole argument.
A tulou’s outer skin can be six feet thick at the base, tapering as it rises, and it was made by hand in a way almost insulting in its simplicity. The Hakka raised it in horizontal courses, pouring damp earth between wooden frames and pounding it with rammers — hāngtǔ (夯土), rammed earth — until the layer was dense as stone, then moving the frame up and doing it again. Course by course, a mountain of the valley’s own red soil rose into a wall.
And here is the material secret the builders guarded like a family recipe: the earth was not pure earth. They mixed it with slaked lime (石灰) and, crucially, with glutinous rice paste — nuòmǐ huījiāng (糯米灰浆), the sticky mortar of sticky rice, the same trick that had held together city walls and tombs for two thousand years. The rice made the soil set like glue; some old walls are so hard that a driven iron nail cannot be drawn out, and a 2016 earthquake left the tulou standing while concrete buildings in the county town cracked.
Think about what that means. A family that had almost nothing — soil that grew more stones than grain — built a home that outlasted poured concrete. They needed no steel, no imported cement. They needed the ground under their feet, the limestone of the hills, and the rice paste of the dinner pot. The wall is the whole philosophy of the Hakka in one layer of earth: what little you have, you make last for the people you love.
And at the heart of it all, on the ground floor, stood one stone well (井) — a single source of water for the whole ring — and the ancestral hall (祖堂), the one shrine all two hundred families shared. One surname, one well, one hall, one sky.
Chapter III: A Door, a Shrine, a Well — the Program of a Collective Life
Strip a tulou down and it is only four things, repeated for a hundred households.
One gate. The single door to the outside world, thick and barred, the only way in. In peacetime it was where guests were met; in trouble it was where everything stopped.
One ancestral hall. Not a private family room but the geometric center of the ring, where the lineage’s ancestors were remembered and its ceremonies performed — weddings, funerals, the new year. The dead did not live in a corner; they lived at the exact middle of the circle, so that every room faced them.
One well. Water, the thing that makes a siege survivable, was shared by all — not rationed out by rank but drawn from a single stone mouth at the center, where the whole clan met at dawn. In a tulou, water and memory are both at the heart.
One roof, one sky. The rings of rooms step upward to a shared edge, and above everything is the round patch of sky the architect saw framed over his head. In the old symbolism this circle of heaven — round echoing round heaven, while square layouts echoed a square earth, the tianyuan difang (天圆地方) reading — made the building a small, complete cosmos: the family as a whole world, with its own sky, its own water, its own ancestors, shut safely inside a ring of earth.
The foreign visitors who call it a “UFO” or a “flying saucer” are not wrong about the shape — from the air, in mist, a round tulou in a green valley does look like something from another world. But they are wrong about the cause. Nothing here is alien. It is the most provincial, most practical thing imaginable: a clan, under threat, doing what a clan does. The saucer is not a machine that landed. It is a hug that grew a wall.
Three Things That Hold the Circle Together
Find Your Own Circle
None of us lives in a tulou anymore. Most of us live along corridors, facing doors that face other doors.
But the question the tulou asks is still open: what would your home look like if it were built to hold the people you love together, instead of to give each of them more space? The Hakka did not ask for more room. They asked for more of each other, and then made a circle that guaranteed it. None of this predicts your future, and no tulou ever prevented a family quarrel — the walls were full of them, one loud argument echoing off rammed earth into every ring. What the circle promised was humbler and stranger: that everyone could face the same center and still have their own room in the ring.
A Moment to Keep
Draw a circle on a scrap of paper. Put your name at the edge of the ring — not the center. Name the one thing at the middle that all your days turn toward. A named center, like a named room, is already half-kept.
Frequently Asked Questions
1. What is a Hakka tulou (土楼)? A tulou is a large, fortified, multi-storey communal building of the Hakka (客家) people in the mountains of southwestern Fujian (福建) — most famously a round ring of rammed-earth walls, four or more storeys high, housing an entire clan of up to several hundred people under one roof. Some of the largest, like Chengqi Lou (承启楼) in Nanjing county, hold over 270 rooms in concentric rings around a single ancestral hall. In 2008, 46 tulou were inscribed on the UNESCO World Heritage List.
2. Why are tulou round instead of square? Partly defense and partly fairness. A ring has no hierarchy: every room faces the same center, well, hall and sky, so no family gets the “better” side a rectangle bestows on its main hall. The round shape also echoes the old tianyuan difang (天圆地方) reading of a round heaven over a square earth, making the building a small, complete cosmos. Not all tulou are round — earlier ones are square or rectangular — but the circle became the most famous form.
3. What were tulou walls made of, and why are they so strong? Rammed earth (夯土) — the valley’s red soil pounded layer by layer between wooden frames — mixed with slaked lime (石灰) and glutinous rice paste (糯米灰浆). The sticky-rice mortar made the soil set nearly as hard as stone, resistant to rain, heat and earthquake. Some walls are six feet thick at the base, and many tulou survived the 2016 earthquake that cracked nearby concrete buildings.
4. Why did the Hakka build fortified communal homes? The Hakka were migrant people who arrived late to settled regions and often received only marginal mountain land. The tulou’s windowless lower walls, single iron-sheeted gate and shared well were built for defense against bandits and unrest — but the communal ring also protected against the deeper threat of family disintegration, making shared living and a single ancestral identity the unavoidable architecture of daily life.
5. Can you still live in a tulou today? Yes. Many tulou remain inhabited by Hakka families — some as working homes, others opened to visitors or turned into heritage museums. Others are threatened by age and abandonment, so preservation efforts and World Heritage status (2008) seek to keep both the buildings and their living communities intact: the same walls still holding the same surname.
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