In Fukushima, a museum with a single artwork keeps the memory of the 2011 disaster alive with 3,000 lights

On March 11, 2011, a magnitude 9.0 earthquake—one of the strongest ever recorded—struck off the coast of Japan's Tohoku region. Minutes later, tsunami waves reaching up to 40 metres swept across the shoreline, wiping out entire towns and leaving nearly 20,000 people dead or missing. The disaster also triggered the meltdown of the Fukushima Daiichi Nuclear Power Plant, causing the world's most severe nuclear accident since Chernobyl and forcing more than 150,000 residents to evacuate their homes.

Fifteen years later, Japan is preparing to open one of the country's most significant memorials dedicated to that catastrophe. Scheduled to open in 2027 on a site between the Fukushima Daiichi and Fukushima Daini nuclear power plants, Sea of Time – TOHOKU Museum is unlike any conventional museum. Embedded into the landscape like a monumental stone mound overlooking the Pacific Ocean, it will house a single permanent installation: three thousand LED counters, each moving at its own rhythm, transforming time itself into a measure of memory. From afar, the building appears as a vast stone disc gently emerging from the earth. Only on approach does its concealed entrance reveal a subterranean world carved into the ground.

Sea of Time – TOHOKU is simultaneously an artwork and the museum built to contain it. The installation was conceived by Japanese artist Tatsuo Miyajima, who has spent more than a decade working on the memory of the 2011 disaster—first as a volunteer in the devastated areas and later through an extensive participatory project involving survivors. The museum was designed by Tsuyoshi Tane, founder of ATTA – Atelier Tsuyoshi Tane Architects, whose previous museum projects include the Estonian National Museum in Tartu and the reinstallation of the Al Thani Collection at Hôtel de la Marine in Paris.

Miyajima's work consists entirely of digital elements: three thousand LED counters, each representing a single human life. Arranged across the floor of a vast circular chamber immersed in darkness, every counter advances at a different speed, reflecting the unique rhythm of an individual existence. The pace of each light was determined by survivors who took part in the artist's workshops over the past decade.

Tatsuo Miyajima

Beyond the glowing field of numbers, the Pacific Ocean stretches across the horizon. If the artwork measures time, the building attempts to measure memory. Although the museum contains only one installation, its architecture emerged from years of research through what Tane calls “Archaeology of the Future”. “Every place carries layers of memory—traces of human life, transformed landscapes, forgotten stories, cultural narratives, and invisible emotions accumulated over time,” he explains to Domus . “Rather than imposing form onto a site, we try to excavate these layers and translate them into architecture. ” 

For Sea of Time – TOHOKU Museum, that research meant excavating the many layers of memory embedded in the coastal town of Futaba: its geology, its cultural history, and the traces left behind by the 2011 earthquake, tsunami and nuclear disaster. It was this fieldwork that ultimately gave rise to the project's defining architectural elements: stone and the circle. During repeated visits along the Tohoku coastline, Tane was struck by the enormous boulders displaced inland by the tsunami. “These displaced stones had become physical witnesses of both destruction and time,” he says. “From that moment, stone became inevitable.” From that discovery came the idea of shaping the museum as a monumental stone mound that appears to emerge naturally from the earth, as though it had always belonged to the landscape.

The circular plan follows the same logic. “Tatsuo Miyajima’s work is fundamentally linear and rectangular. If architecture followed the same geometry, it would inevitably become a frame around the artwork. By introducing a circle, we created a form without direction, hierarchy, front or back, allowing the artwork and the horizon to remain central.” Rather than becoming an object within the landscape, the architecture deliberately steps back, allowing the installation, the sea and the horizon to become the true protagonists of the experience.

In Fukushima, the sea is everywhere. It is the force that destroyed entire towns in March 2011, but it is also what has sustained local communities for generations. Sea of Time never attempts to resolve this contradiction. Instead, it embraces it as the project's starting point. “Among all the people I spoke with—even those who had lost their homes, their livelihoods or family members to the tsunami—not a single person spoke ill of the sea,” Miyajima tells Domus. “They have lived with the sea, laughed with the sea, wept with the sea and persevered alongside it throughout their lives. For them, the sea is not merely a geographical feature or a symbol of tragedy—it is synonymous with life itself.”

The same understanding shaped Tane's architectural response. Rather than separating the building from its surroundings, he designed it to remain open to the landscape. A long horizontal opening cuts across the underground gallery, allowing the Pacific Ocean to become part of the exhibition itself. The horizon is no longer a backdrop but an active presence, while the museum changes constantly with the shifting light, the wind, the seasons and the movement of the sea.

The ocean also prevents the museum from becoming a static image of the past. “We did not want to create a monument to preserve the disaster in stillness. Instead, we wanted to create a place where memory could continue moving forward.” Every visit becomes a different experience because the landscape entering the building is never the same. While the LED counters continue marking the time of human lives, the ocean introduces another rhythm altogether: the immeasurable timescale of nature, inseparable from the history of this catastrophe.

Beyond its stone walls and circular geometry, time is perhaps the true material of Sea of Time – TOHOKU Museum. Not only the time counted by Miyajima's LED counters, but the time that gradually reshapes a society's relationship with its own history. On March 11, 2011, Tatsuo Miyajima was in his studio in Tokyo. Tsuyoshi Tane, meanwhile, was living and working in Paris. When the earthquake and tsunami struck northeastern Japan, both witnessed the devastation of their country from radically different perspectives—one from within Japan, the other from thousands of kilometres away. Looking back on the years that followed, Miyajima says the greatest danger was not only the disaster itself, but the speed at which its memory began to disappear.

“What alarmed me most was the rapid erosion of memory,” he recalls. “Within a mere three years, that collective memory began to fade rapidly.” In the immediate aftermath of the earthquake, Japan experienced an unprecedented wave of public debate, from anti-nuclear demonstrations to discussions about energy policy and the reconstruction of devastated communities. Yet that sense of urgency proved short-lived. For Miyajima, the disaster also marked a profound personal crisis.

Tsuyoshi Tane

“The earthquake, tsunami and nuclear disaster plunged me into the deepest despair of my life, forcing me to confront the absolute helplessness of art,” he says. “I learned, in the most painful way, that human beings are ultimately powerless against the overwhelming force of nature.”

Tane experienced a similar sense of helplessness. Returning to Japan two months after the disaster, he travelled through Ishinomaki and other devastated towns, searching for a way to contribute as an architect. For years, however, he felt unable to find one. When Miyajima invited him to design Sea of Time – TOHOKU Museum, he immediately recognised the project he had been waiting for: not a building that claimed to explain an unimaginable tragedy, but a place where memory could continue to evolve through time.

“Architecture cannot heal every wound. It cannot erase scars, nor can it change what happened,” Tane tells Domus. “But architecture can create a place where people gather, where memories are carried forward, and where future generations can continue the story.”

Video | Yuki Iwanami, Masanobu Nishino
Animation, Images | Atelier Tsuyoshi Tane Architects

Opening image: Atelier Tsuyoshi Tane Architects, Sea of Time - TOHOKU Museum, 2027, Tomioka, Japan ©Atelier Tsuyoshi Tane Architects