Man makes preserving heritage a joint effort

Gansu woodworker passes the art of traditional mortise and tenon joints to his son

Woodworker Sun Gang has spent most of his life learning and preserving the traditional mortise and tenon technique widely found in ancient Chinese buildings and furniture.

Some old buildings contained no nails, and instead used interlocking joints to connect pieces of wood, with the earliest example of a mortise and tenon structure dating back 7,000 years to the Hemudu culture in what is now Zhejiang province.