There are techniques to use for wood joinery without a nail or a metal ware in Japan, it is called "KIGUMI 木組".
Those techniques have been inherited since ancient times.
There are many kind of Kigumi 木組, each technique is used for appropriate part along with it's purpose.For example, Chidori-koshi 千鳥格子 is one of complicated joint. It was applied to fence of jails in the past.
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