[Why] Song-era woodblock printing technology was mature but still faced structural bottlenecks of huge storage space for printing blocks, inconvenient modification, and time-and-money-consuming new-book typesetting. The commercialized large-scale circulation of books urgently required new technical breakthroughs. [What] The Northern Song commoner craftsman Bi Sheng used clay to carve single-character type and baked them hard into movable type, arranged on demand inside an iron frame and printed. Once a setting was printed, the type could be dismantled and reset for a new book, opening the great precedent of movable-type printing. [Who] Bi Sheng was a commoner-born great folk inventor of supreme technical talent. Shen Kuo in Dream Pool Essays recorded Bi Sheng's invention process in detail, allowing this great technology to be passed down. [How] Bi Sheng's movable-type printing predated Germany's Gutenberg by over four hundred years and stands as a revolutionary breakthrough in human knowledge transmission. Through Korean and European improvement and promotion it deeply changed the global pattern of book publishing and civilizational heritage.
Why
The historic event of Bi Sheng's Movable Type represents a key developmental peak of the Huaxia dynastic system. The revolutionary breakthrough in knowledge transmission predating Gutenberg by four centuries. By establishing this moral or administrative benchmark, it continues to shape the structural and philosophical fabric of ancient Chinese statecraft.