Ulf Solter, director of Gutenberg Museum, shows the portrait of German printer Johannes Gutenberg in Mainz, Germany, March 21, 2025. （Xinhua）

A man visits the Bi Sheng Memorial Hall in Yingshan County, central China's Hubei Province, April 2, 2025. (Xinhua）

This photo taken on March 21, 2025 shows a document printed via metal movable type printing technique at the Gutenberg Museum in Mainz, Germany, March 21, 2025.（Xinhua）

A staff member of the Gutenberg Museum showcases the Gutenberg printing technique in Mainz, Germany, March 21, 2025. (Xinhua）