Masamichi Katayama is a Japanese interior designer whose work operates at the intersection of interior design, architecture and cultural space. As the founder of the Tokyo-based studio Wonderwall®︎, Katayama has built an internationally recognised practice defined by precision, restraint and a deep sensitivity to how people inhabit space.
Rather than approaching interiors as decorative environments, he treats space as a form of cultural expression. His work consistently blurs the boundaries between interior design and architecture, engaging with structure, proportion and materiality while remaining grounded in human experience. This philosophy is particularly evident in his collaboration with NOT A HOTEL, where spatial design becomes a dialogue between tradition, landscape and contemporary living.
Katayama’s work demonstrates that the most enduring spaces are not defined by excess, but by clarity, intention and cultural awareness.
In the project NOT A HOTEL KITAKARUIZAWA MASU, located in the forested mountains north of Tokyo, Katayama draws inspiration from sukiya-style architecture, traditionally associated with tea rooms and spaces of contemplation. Instead of reproducing historical forms, he reinterprets their principles through a modern lens, favouring clarity, rhythm and spatial calm. The result is an environment that feels neither nostalgic nor overtly modern, but quietly balanced.
Katayama often describes his design process as akin to furniture making, where even structural elements are treated with the same level of attention as crafted objects. This approach underscores his belief that spatial design should be intimate, tactile and purposeful. In his work, cultural references are never applied superficially; they are embedded in proportion, flow and atmosphere.
Operating at the crossroads of interior design, architecture and cultural space, Masamichi Katayama represents a practice rooted in observation rather than spectacle. His work suggests that contemporary design does not need to announce itself loudly to be impactful. Instead, it can exist as a quiet framework for living, where space, material and context come together in measured harmony.
Image credits: Courtesy of NOT A HOTEL / Masamichi Katayama (Wonderwall®︎)