Kanawa Tsugi was developed as carpenters sought mechanically locked scarfs Joints for temple and shrine work. Carpenters rely on it for lengthening roof beams and repairing rotted posts where a simple scarf would fail under bending. The joint appears in major restoration projects across Japan, where identical geometry on both halves allows a splice to slide together in confined spaces beneath the structure.
   

Designed by Masashi Kutsuwa in 2007, award winning design

This pen case is award winning piece by Masashi Kutsuwa in Takaoka craft Competition in 2008.

One of 3 different designs all inspired from Japanese traditional joinery.