YDS intends to create space with light by this work.
In Tatami room, there are two slit windows with different angles from which natural light are brought about, creating transitional beauty of the light. 
The light from these slit windows changes from time to time and from season to season, expressing deep beauty of the nature.
Two slits intersect at right angles, allowing very different types of natural light to stream into the space at the same time.
At times, the light from one slit is strong and the light from the other is weak, and at other times the light is inverted.
The idea was to use these slits to scoop up natural light, creating a space where one can feel the "true beauty of natural light" and the "ultimate diversity of natural light."

We placed great importance on creating the details of the simple slit sashes, as if "glass was fitted into an opening in the wall."
We then verified how the light would enter through the slits using models and CG, and carefully determined the width of the sashes. The slit sashes were not too wide and not too narrow, and were of the most appropriate width to capture the natural light most beautifully.

The tatami mats are made from Ryukyu tatami mats, and are laid out in a checkerboard pattern that is as close to a square as possible, creating a design that alludes to the grid of traditional Japanese framework construction.
Domestic cedar laminated lumber is used to cover the pillars. This cedar laminated lumber is 18mm thick, and this thickness gives the room a "depth of material" that cannot be achieved with wood finishing materials that are only a few millimeters thick.

Team:

Architects: YDS

Photographer: Nobuki Taoka

Materials Used:

Facade cladding: White Spray, SK-Materials
Flooring: Solid Hinoki, Nojimoku
Doors: Veneer-flash,YDS
Windows: Alminium Sash, YKK
Roofing: Asphalt Roofing, Tajima
Interior lighting: Lighting, Koizumi Lighting
Interior Wall: Cedar lumber, Nojimoku
Nakagiri-shima-wall, Takachiho-Shirasu