Kakushin Office: A Geometric Green Forest in Tokyo

Most office interiors fall into two categories. They are either anonymous (grey carpet, white walls, fluorescent grids) or they are loud in the obvious way (a single wall painted bright, a swing in the corner, a beanbag pit). The Kakushin Office, a 100 square metre interior in Tokyo completed in 2026 by Moriyuki Ochiai Architects, belongs to neither category. It is one of the more disciplined experiments in workplace atmosphere we have seen in some time.

The brief was to design an office and showroom for an automotive enterprise, the Kakushin Group. The architects, led by Moriyuki Ochiai, chose to think of the room as a forest. Not literally, with planters and timber. Conceptually, as a field of luminous green forms that resonate against the surrounding pale walls. The result is an interior that reads more like an installation than a workplace, but functions as both.

A Forest Made of Geometry

The first move is the ceiling. Triangular and angular cavities are cut into a pale plaster surface and painted a saturated, slightly luminous green. From below they read as openings into another layer, as if the ceiling were a forest canopy with light filtering through gaps. There is no single shape repeated. The cavities vary in size, orientation, and depth, so the rhythm feels organic rather than mechanical.

The same logic continues on the walls. Triangular insets, again painted green and textured, puncture the otherwise neutral plaster. The wall and ceiling become a continuous field. Standing in the room, you start to lose track of which surface is which, the way you might in dappled forest light.

The Furniture Is Part of the Field

The reception desk and the long counters are not separate objects sitting in the room. They are extensions of the same geometric language. The bases are folded white forms with triangular green undersides, so the furniture reads as if the floor itself had been folded up to meet the ceiling pattern.

This is the move that takes the project from clever to coherent. A lot of installation-driven interiors get the ceiling right and then put a normal desk underneath it. Here the desk participates. The triangular vocabulary runs through every element, including the small inset panels in the rear wall and the faceted fronts of the counters.

Light, Texture, and the Plaster Wall

The plaster surfaces were painted by Osamu Yamaguchi with a special technique that gives the green areas a slightly mottled, leaf-like quality. The lighting, by Endo Lighting, is tucked into the cavities so the green appears to glow rather than reflect. From most angles, you cannot see the light source. The colour just emerges from the openings.

This is unusually careful work. Office interiors rarely get this level of attention to surface and lighting because the budget for a small workplace is almost always too tight to allow it. The architects clearly negotiated for it because the entire project depends on it. Without the texture and the hidden lights, the green would feel flat and the geometry would feel decorative.

Atmosphere as Function

The architects describe the project as a place where luminous green forms resonate and reverberate. That language could read as marketing, but the photographs back it up. The room has a distinct atmosphere that is calm, slightly disorienting, and clearly different from any other office on the floor.

This matters for an automotive showroom in particular. The showroom's job is to make a customer feel like they have walked into something specific. A generic interior fails that test immediately. The Kakushin Office does not. From the moment you step in, the room is doing work that no amount of furniture or branding could replicate.

The Detail at Close Range

Up close, the project rewards attention. The triangle cavities have crisp, sharp edges. The plaster has texture you can almost feel through the photograph. The transitions between white and green are clean and deliberate. Nothing is improvised or finished sloppily, which is essential when the entire architectural idea depends on a single repeated gesture executed at different scales.

This kind of precision is what most installation-style interiors lack. They start with a strong idea and then run out of budget at the detail level. Kakushin Office holds the line.

Plan

The plan is straightforward: a single rectangular room with the long counter and the rear wall as the two main spatial events. The architectural complexity is entirely in the third dimension, in the ceiling cavities and the wall insets. The plan does not try to be more than it needs to be.

Why This Project Matters

Small interior projects are where most architects develop their ideas before scaling them up to buildings. A 100 square metre office is exactly the right size to test whether a single architectural gesture can carry an entire room. Kakushin Office answers that question affirmatively. The geometric forest works because the architects committed to it completely, from the ceiling to the desks to the lighting to the surface texture.

The lessons are useful for anyone designing a small interior with a strong concept. Pick one architectural idea. Apply it everywhere, including the furniture. Spend the surface budget on texture, not finish. Hide the light source. Trust the room to do the work. Moriyuki Ochiai Architects has put together a clean example of all five moves, and the photographs by Daisuke Shima capture the result with the same care.

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Project credits: Kakushin Office (Resonance of Green) by Moriyuki Ochiai Architects. Tokyo, Japan. 100 m². Completed 2026. Design team: Moriyuki Ochiai, Jun Ueda, Homa Mahmodi, Theo Todd. Special paint: Osamu Yamaguchi/coat. Plaster: Yawata Kogyo. Lighting: Endo Lighting. Client: Kakushin Group. Photographs: Daisuke Shima.