Sashiko boro is the Japanese folk practice of mending worn indigo-dyed cotton and hemp with white running stitches, layering patch upon patch until a garment becomes a palimpsest of deep navy fragments. Born of pre-1900 rural thrift, it reads as a dark kon-iro field gridded with fine ecru stitching and broken by sun-faded lighter-blue patches.
This design system translates that worn cloth into an interface: deep indigo grounds, overlapping rectangular patches with visible seams, dense hand-stitch geometric grids, and the occasional madder-red mend. The surface is woven fabric, never paper.
刺し子襤褛（Sashiko Boro）是日本民间用白色平针缝补蓝染棉麻旧布的手艺：一块布上层层叠补，最终化作深藏青碎片拼缀的"布之拓本"。它源自1900年以前农渔村落的惜物之心（もったいない），呈现为深蓝（绀色）底布上以细密米白针脚织出的几何网格，间杂日晒褪色的浅蓝补丁。
本设计系统将这块旧布转译为界面语言：深靛蓝底色、带可见接缝的矩形叠补、密集的手缝几何针脚网格，以及偶现的茜草红补缀。表面始终是织物的肌理，而非纸张。