According to Wikipedia, Sashiko is a Japanese word which literally means “little stabs”. It is a form of decorative reinforcement stitching, or functional embroidery, from Japan. Traditionally used to reinforce points of wear, or to repair worn places or tears with patches, this running stitch technique is often used for purely decorative purposes in quilting and embroidery. The white cotton thread on the traditional indigo blue cloth gives sashiko its distinctive appearance, though decorative items sometimes use red thread.
Wow. This looks painstakingly time consuming but gorgeous. Can’t wait for the finished wall hanging.