Movable type printing, invented around 1041 AD by Bi Sheng in the Song Dynasty, is one of the Four Great Inventions of ancient China. Paper is pressed against a board with characters carved into small blocks that could be rearranged. It means people don't have to carve a huge block when they print a new book. This invention makes printing more efficient and easier and is a milestone in the history of human cultures. Take a tour of a workshop in Dalian, a city in northeast China, to experience this ancient technique, which could give you an insight into traditional Chinese culture.