At Expo 2025 Osaka, Kansai, the signature pavilion null² (Null-Null), produced by Yoichi Ochiai, drew attention for its distinctive mirrored architecture and immersive experience, where physical reality and the digital world intersected. Carrying that vision forward, the permanent museum theater null²ⁿ (Null-Null Nexus) opened on October 14, 2026, at Yokohama Landmark Plaza.

photo by ©FASHION HEADLINE
From the temporary setting of a world exposition to the everyday fabric of a city, a new space has emerged in which visitors can experience “Digital Nature,” or computational nature, a concept Ochiai has explored for many years. Through moving images, sound, mirrors, and the human body, the theater invites visitors to reconsider their relationship with technology.

At a media preview held ahead of the opening, Ochiai explained the ideas behind the project and his thinking about the evolving relationship between humans and technology. Experiencing the theater firsthand revealed something beyond a showcase of advanced visual technology. It was an encounter in which visitors seemed to enter the imagery themselves, physically sensing the shifting boundaries between humans and AI, and between the real and the virtual.

From Expo 2025’s null² to Yokohama’s null²ⁿ

At Expo 2025 Osaka, Kansai, null² combined architecture clad in shifting mirrored surfaces with digital experiences that questioned the nature of the human body and existence.

Its successor, null²ⁿ, carries forward that vision while introducing a new interpretation. According to Ochiai, the Yokohama project incorporates ideas that could not be realized at the Expo, alongside a greater number of physical devices and objects. The experience has been reconfigured for its new setting.

photo by ©FASHION HEADLINE
The facility comprises five experiential areas. At the entrance, visitors encounter a vibrating, shifting installation reminiscent of the Expo pavilion’s exterior. Visual effects are accompanied by sound that can be felt through the body as well as heard, creating a transition from the familiar surroundings of a shopping complex into an unfamiliar environment.

photo by ©FASHION HEADLINE
The mirror theater that follows reinterprets experiences originally presented in Osaka. Artificial life forms, encounters with one's own digital-human counterpart, and landscapes generated through the interplay of AI and human creativity unfold within an environment surrounded by mirrors.

photo by ©FASHION HEADLINE
Another space dispenses entirely with visual projections, using sound to heighten awareness of the body's presence and position.

photo by ©FASHION HEADLINE
Elsewhere, cameras, tools, and other media devices developed and used throughout human history are brought together, inviting visitors to consider the relationship between physical objects and information.

photo by ©FASHION HEADLINE
In the final mirrored space, visual expressions evoke the ways computers perceive the world and the processes through which AI learns. Having moved through these experiences, visitors eventually return to the physical world outside.

Although each area employs a different form of expression, they are connected by a common theme: reconsidering the relationships among the human body, intelligence, tools, and computation through sensations that extend beyond sight and hearing.

Inside the Mirrors, the Viewer Becomes Part of the Artwork

Entering the mirror theater, one of the most striking sensations is the gradual dissolution of the boundary between imagery and reality.

Images projected across the surrounding surfaces are reflected repeatedly, extending the apparent depth of the space. Within those reflections appear the visitors themselves, along with others sharing the room.

photo by ©FASHION HEADLINE
You begin by watching the imagery, only to realize that you have become part of it.

As reflected bodies overlap with digital images, moments arise when the distinction between physical space and artwork becomes difficult to define. Conventional moving-image experiences generally separate the viewer from what is being viewed. Here, the viewer's presence actively alters the visual experience.

photo by ©FASHION HEADLINE
The number of people in the room, their positions, and their movements can all change the scene unfolding before them.

The relationship shifts from humans observing a digital world to humans becoming part of what constitutes that world. One of the defining qualities of null²ⁿ is that this transformation can be felt physically, even before its underlying ideas are explained.

From Humans Making Tools to Tools Making Tools

Among the most compelling themes Ochiai discussed at the preview was the changing relationship between humans and their tools.

Throughout history, humans have invented tools to extend their physical capabilities and make everyday life easier. From stone implements and machines to computers and smartphones, the forms have changed, but the fundamental relationship has remained largely consistent: humans identify a need, devise a tool, create it, and put it to use.

photo by ©FASHION HEADLINE
The development of AI, however, is beginning to challenge that premise.

We are approaching an era in which humans are no longer the only ones designing tools. AI may conceive new tools, while machines manufacture them according to AI-generated designs. Nonhuman systems are beginning to play a role in the creation of new tools, potentially transforming a process that has long been driven by human ingenuity.

Ochiai suggested that these changes could transform not only how people think and communicate, but also how they understand the body and intelligence itself.

This perspective leads toward the concept of Digital Nature, which has been central to Ochiai's work.

Will AI remain a convenient tool that we operate whenever we need it? Or will it become something more like air, water, or wind—something that exists and acts beyond our immediate intentions, shaping the environments in which we live?

photo by ©FASHION HEADLINE
AI is, of course, a technology created by humans. Yet as such systems become capable of processing information autonomously and generating new technologies and structures, the relationship between humans and AI may no longer be adequately described through the familiar relationship between people and their tools.

The idea of computational nature offers a way to consider that emerging future.

Rather than presenting this concept as a theory to be studied, null²ⁿ creates an artistic experience through which visitors can sense a world where humans, computation, and nature increasingly intermingle.

Why Traditional Tools and Advanced Digital Imagery Share the Same Space

One of the intriguing aspects of null²ⁿ is that its experience extends beyond digital imagery.

Ochiai explained that while the Expo pavilion contained relatively few physical exhibits, the Yokohama theater incorporates a much wider range of tangible tools and devices.

photo by ©FASHION HEADLINE
A space filled with cameras, tools, and objects that humans have used for generations presents a striking contrast to the futuristic mirror theaters. Yet both are concerned with the same fundamental questions.

Humans have long used tools to perceive, record, and transform the world. Cameras preserve visual information, tools extend the capabilities of the body, and computers expand our ability to process information. Today, AI is entering fields that include creation and design, moving beyond information processing alone.

By placing older tools alongside emerging technologies, the exhibition encourages visitors to consider what humans have entrusted to their inventions—and what they may entrust to them in the future.

The movement between advanced digital expression and tangible objects with physical weight also reveals null²ⁿ as a work concerned with the history of humanity's relationship with technology.

A Museum Theater That Continues to Evolve

The original null² existed within the limited timeframe of Expo 2025 Osaka, Kansai. In contrast, null²ⁿ is a permanent venue designed to welcome visitors over a much longer period.

During the preview, Ochiai noted that although the Expo pavilion attracted considerable interest, the number of people able to enter was necessarily limited. In Yokohama, he hopes that more people will have the opportunity to experience the work over the coming years.

photo by ©FASHION HEADLINE
Another important characteristic is that the theater is built around software.

Its imagery, sound, and interactive elements can evolve in response to technological developments and new creative ideas. Ochiai also spoke about the possibility of adapting the theater's content for different occasions in the future.

At the preview, he described how AI had already contributed to the production process. From preparing presentation materials and assisting with programming to advances in the computing resources required to operate an interactive facility, technological progress has expanded both the speed and possibilities of production.

photo by ©FASHION HEADLINE
A work exploring the relationship between humans and AI is itself being created—and potentially updated—through advances in AI and computational technology.

In this sense, the process of making null²ⁿ reflects the very world it seeks to explore.

Bringing the Energy of the Expo into Everyday Yokohama

Ochiai also spoke about the word “Nexus” in the facility's name, expressing his hope that it would become a place where people gather and different activities and ideas connect.

At Expo 2025 Osaka, Kansai, visitors who might not ordinarily encounter contemporary art or emerging technologies had opportunities to engage with new forms of expression and visions of the future.

null²ⁿ brings that experience into the everyday urban environment of Yokohama.

Within the commercial setting of Yokohama Landmark Plaza, there is now a space dedicated to reconsidering the body, intelligence, AI, and nature. People visiting the area for shopping or sightseeing may unexpectedly find themselves encountering contemporary art and technology.

As a permanent venue, it also offers the possibility of returning to the same work and discovering something different over time.

The environments in which we use AI, and the capabilities of AI itself, will continue to change. As those changes unfold, experiencing the same artwork again may give rise to entirely new perceptions.

From the Expo to Yokohama.

What null²ⁿ presents is more than a technologically imagined vision of the future. It asks what happens when tools created by humans gradually become part of the environment surrounding us.

As that relationship changes, how will we understand ourselves, and how will we engage with the world?

Seeing one's own reflection within the artwork may be the first step toward exploring those questions.