Yotaro Sakamoto's Thread Column Turns Visitors into Shadow Makers

A column built from fine threads will rotate in response to visitors' movements at Hibiya OKUROJI in Tokyo, where the installation Schattenrequisit: Column runs from October 30th to November 8th, 2026. Japanese artist, engineer, and researcher Yotaro Sakamoto created the work for DESIGNART TOKYO 2026.

The concept draws from sudare, the traditional Japanese slatted screens that filter light. Sakamoto treats two normally separate things — physical material and immaterial shadow — as unified components of one sculptural composition. The column itself is the instrument. The shadows it casts are the output.

How does the mechanism work?

The installation takes the form of an architectural column constructed from closely spaced fine threads arranged in a cylindrical volume. Millimeter-wave sensors integrated into the work detect the proximity of visitors in the space. A stepper motor, developed through computational design and physical prototyping, then slowly rotates and shifts the thread assembly.

That rotation changes how the linear strands overlap. As the overlap shifts, the shadow silhouettes cast across surrounding walls and floors transform continuously. The thread densities move gradually from tight alignments to open visual fields. A visitor standing near the column therefore rewrites the geometry of the room without touching anything.

What does it change for practitioners?

Sakamoto animates a structural archetype that architects treat as the most static of elements. The column, the very symbol of permanence, becomes a moving register of transient presence. For designers working with responsive environments, the project demonstrates a low-material approach: thread, sensor, motor, and light produce the full effect. No screens, no projections, no digital imagery.

The work also mirrors a larger urban condition. According to the project description, the installation reflects the interaction between fixed urban infrastructure and transient human circulation — the city as a static frame through which people move and disappear. The artwork translates that transient human presence into mechanical and shadow-based movement.

All images of the project are credited to Yotaro Sakamoto.

Project details

• Name: Schattenrequisit: Column
• Artist: Yotaro Sakamoto
• Location: Hibiya OKUROJI, Tokyo, Japan
• Exhibition: DESIGNART TOKYO 2026
• Dates: October 30th – November 8th, 2026

For practitioners tracking the boundary between installation art and responsive architecture, Sakamoto's piece offers a working proof that a millimeter-wave sensor and a single stepper motor can convert circulation data into an architectural phenomenon — shadow — that occupants read instinctively. The ten-day run at Hibiya OKUROJI gives Tokyo audiences a concentrated window to test that proposition with their own movement.