He Yufei/ Expert, Disciple of Xin Quansheng: Here is the world’s largest Luban Lock. It weighs over 650 kilograms and is made up of 99 pieces, and can even be disassembled and reassembled.     At the SCO Summit 2025 in Tianjin, the media centre offered international journalists a hands-on experience of China’s rich cultural heritage – showcasing the Luban Lock, a puzzle toy invented by the legendary carpenter Lu Ban over two thousand years ago.   He Yufei: We start by letting foreign guests experience the Luban Lock themselves. As they try to take it apart and reassemble it, they begin to understand the principles behind the mortise-and-tenon structure.   It’s a fun way to introduce our traditional craftsmanship and intangible cultural heritage to the world.   Though the Luban Lock may look like a simple puzzle, the mortise-and-tenon principles behind it are anything but. The same interlocking structures are still found across China today – from the dovetail joints in traditional furniture to the grand bracket sets in ancient architecture – proving that this centuries-old ingenuity continues to shape daily life.   From playful puzzles to grand displays of craftsmanship, the Luban Lock exhibit gave international journalists a first-hand glimpse of China’s centuries-old ingenuity and traditions.