A geometric lattice is easier to appreciate when its pattern is connected to the fit of its parts. Kagawa Prefecture’s profile of joinery craftsman Satoshi Okano focuses on jigumi, the base grid, before the smaller pieces of the design are inserted.
Technique and structure
The profile describes kude shoji made by assembling grooved wooden members without adhesive or nails. Okano explains two different fit problems: an overly wide groove leaves the joined piece loose, while an overly narrow groove prevents it from fitting properly. A base grid that is too tight also makes later pattern pieces harder to insert. Groove preparation is therefore part of making the whole pattern possible, not just a preliminary job hidden behind the finished geometry.
An image does not supply the fit
The account describes checking the groove with an actual wooden piece and considering the faces and grain of the material. These are decisions about the parts being worked, not a numerical tolerance supplied by the article. The source gives no universal groove width or cut angle to transfer to a different design.
That distinction matters when commissioning work from a picture. The image can communicate a desired appearance; the joiner still has to determine the construction that will realise it.
For international readers
Ask which parts, material and joinery a proposed piece will use. This explanation is not a structural rating or a cutting plan, and it does not reproduce the craftsperson’s patterns.
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日本語
組手障子：地組みの溝合わせが文様を支える
香川県の岡野悟史さんの紹介では、接着剤や釘を使わない組手障子と、地組みの溝幅を確認する仕事が説明されています。広すぎる溝と狭すぎる溝は別の問題を生み、後から木片を入れる作業にも影響します。写真の文様だけでは寸法は決められません。