Traditional Japanese buildings do not use nails or glue. Instead, timbers are connected by elaborate dovetail joints.

Japanese wood joinery dates back to the seventh century and is a craftsmanship technique that involves complicated, interlocking wooden joints that form bonds without the use of nails, screws or adhesives. Even until recent times when carpentry books began to be published, mastery of these woodworking techniques remained the fiercely guarded secret of family carpentry guilds.

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