Kumiko is a technique of assembling thin wooden planks in a geometric pattern without using nails. It is a technique of assembling thin wooden planks into geometric patterns without using nails. Kumiko was created about 1,400 years ago during the Asuka period (710 794), and is said to be the world's oldest surviving wooden structure. Horyuji Temple, the world's oldest surviving wooden structure, was built about 1,400 years ago during the Asuka Period.
The demand for decorative braided wood fittings spread during the Heian period (DC 794 1192) and later, and by the Muromachi period (1333 1573), the tea ceremony and flower arrangement spread, and the Shoin style of living was born, The technique of Kumiko work also progressed. The technique of Kumiko zaiku in Nagano Prefecture uses Kiso Hinoki, a 250 to 300 year old natural cypress tree grown in the Kiso Valley. Kiso Hinoki, a 250 to 300 year old natural cypress grown in the Kiso valley. The Kiso cypress from the Kiso valley, where winters are severe,has a beautiful grain with tight annual rings. It takes three times as long to reach the same thickness as ordinary cypress. Horyu ji Temple is also made of cypress, which has been used to support the temple for over 1,300 years.It is also a very durable wood that supports Horyuji Temple for more than 1,300 years. It also gives the craftsmanship a graceful appearance.