Reaction Field by Yong Ju Lee Architecture: A Dynamic Urban Landscape Installation in Seoul

Reaction Field, designed by Yong Ju Lee Architecture, is a groundbreaking public installation located in a rooftop garden in Seoul, South Korea. Spanning 380 m², this large-scale public furniture project reimagines how people interact with urban spaces through algorithmic design, curvilinear geometry, and nature-inspired patterns. Completed in 2024, it merges landscape architecture, public art, and computational design, creating a fluid environment that blurs the boundaries between structure and landscape.

A Curvilinear System Inspired by Nature

The heart of the project is its striking curvilinear pattern that radiates and branches out from a central circular canopy. This pattern is generated using principles from Alan Turing’s reaction–diffusion system, a mathematical model that explains how natural patterns—such as animal stripes, leaf arrangements, and coral formations—emerge through self-organization.

By applying this algorithmic logic, the designers created a structure where curves expand outward systematically, respecting rules that regulate spacing, height, and flow. The result is an installation that appears organic, yet is entirely computationally orchestrated.

A Reflective Canopy That Redefines Space

The central canopy not only anchors the installation visually, but also alters spatial perception. Made of polished stainless steel, it mirrors the intricate ground pattern, visually merging the sky, the reflective surface, and the flowing geometry beneath.

Rather than being a simple shelter, the canopy operates as a mediation device—merging real and mirrored environments, artificial form and natural context, and daylight and shadow. It encourages curiosity and interaction, stimulating visitors to explore the space from multiple viewpoints.

Materiality That Enhances Form and Experience

The structure is built from a durable metal framework, topped with white-treated silicate wood decking. The bright wood contrasts sharply with the surrounding greenery and the riverside landscape beyond, emphasizing the movement of the curves and creating a surreal, almost dreamlike field.

This minimalist color palette enhances the installation’s visual identity, transforming the rooftop garden into a unique destination rather than a typical urban park.

Functional Public Furniture Integrated into Form

One of the most compelling aspects of Reaction Field is how its curves rise and fall at calibrated heights. These forms transform seamlessly into:

• benches
• leaning surfaces
• tables
• small stages
• elevated seating edges

This integration turns the installation into a fully functional public space, offering areas for rest, gathering, performance, and play—without traditional furniture interrupting the visual language.

A Luminous Landscape After Dark

By night, soft lighting embedded under the wooden surfaces illuminates the curves, turning the installation into a glowing urban sculpture. The daylight pattern of shadows becomes a new nighttime pattern of light, ensuring the space remains active and visually compelling long after sunset.

A New Vision for Public Space in Seoul

Reaction Field stands as a powerful example of future-oriented public architecture. Through its innovative mix of computational design, natural pattern theory, reflective materials, and functional programming, it transforms a simple rooftop garden into a vibrant urban landmark.

It is both a gathering space and a sculptural landscape—a poetic intersection of technology, nature, and human experience.

All the photographs are works of Yong Ju Lee Architecture