Movable type

• 1. Introduction

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  Movable type turned printing into arithmetic. A trained worker using Gutenberg's reusable metal matrix could cast 4,000 to 5,000 individual letters in a single day. Artisans working for the Yuan official Wang Zhen spent two years carving 60,000 wooden characters by hand. That gap between speed and labor sits at the center of this documentary. The story runs from porcelain workshops in Northern Song China to a goldsmith's workshop in the Holy Roman Empire. Long before anyone built a printing press, someone had to solve a different problem. How do you assemble a page from pieces that can be taken apart and rearranged? Wooden seals, brick stamps, and printed paper currency all carried early attempts at an answer. Who actually built the first working system, and why did centuries pass before movable type reshaped how books were made? What did clay, wood, bronze, and lead each solve, and what did each material fail to fix? The answers involve a scholar-official who recorded an invention he did not make, a Korean royal foundry that guarded its own casting technique, and a German goldsmith whose workshop in Mainz would change how the rest of Europe made books.

• 2. Marks Before Printing

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  Around 3000 BC in ancient Sumer, craftsmen used a master type punch made of hard metal to imprint the same symbol onto multiple surfaces. Cylinder seals in Mesopotamia rolled similar impressions into wet clay. Brick stamps found in the Mesopotamian cities of Uruk and Larsa, dating to the 2nd millennium BC, show uneven spacing between impressions. Some archaeologists read that unevenness as evidence the stamps themselves were assembled from movable pieces. The Phaistos Disc, a Minoan artifact from around 1800 to 1600 BC, may have been made by pressing pre-formed hieroglyphic seals into soft clay. One scholar has argued the disc meets every definitional criterion for movable-type printing. In the Roman Empire, officials and individuals sealed documents with a personal insignia, often carried on a signet ring. That practice continued through the Byzantine and Holy Roman empires until wet signatures became the norm in the 19th century. China had its own seal tradition dating to the Shang dynasty, in the 2nd millennium BCE. Western Zhou craftsmen encased sets of seal stamps in blocks used to cast bronzes. By the end of the 3rd century BCE, seals were also used to print on pottery. Northern dynasties texts describe wooden seals carrying up to 120 characters. Some were used by Daoists to stamp therapeutic characters onto the flesh of the sick, and later to stamp hundreds of Buddha images. According to the scholar Tsien Tsuen-hsuin, Chinese seals were square, rectangular, and flat, a shape naturally suited to a printing surface. Western seals, by contrast, were cylindrical or scarab-shaped and built mainly for pictures rather than text. A separate craft, woodblock printing, grew out of the paper that the Han dynasty had made cheap and portable. In the Xiping Era, between 172 and 178 AD, sealing print and monotype began appearing on fabric and paper. By the 8th century, during the Tang dynasty, carvers were cutting entire pages of reversed script into wood. They inked the raised characters and pressed paper against the block by hand. Woodblock printing reached its peak under the Song dynasty. Carving a full plate still consumed enormous time, labor, and material, and correcting a single mistake meant recutting the whole board.

• 3. Bi Sheng's Clay Type

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  Bi Sheng lived from 990 to 1051 and built the first known movable-type system around 1040 AD, during the Northern Song dynasty, using ceramic characters. The scholar-official Shen Kuo described the process in his Dream Pool Essays. Bi Sheng "took an iron frame and set it on the iron plate," Shen Kuo wrote, packing it with type until it formed "one solid block of type." He then warmed the block by a fire, softening a paste underneath the characters. A smooth board pressed over the surface left it "as even as a whetstone." For common characters, Bi Sheng kept twenty or more duplicate types on hand. He stored unused pieces in wooden cases, sorted by paper labels for each rhyme-group. Shen Kuo noted the method made little sense for two or three copies. It became "marvelously quick" once hundreds or thousands were needed, since one form printed while the next was being set. After Bi Sheng's death, ceramic movable type appears to have reached the Tangut kingdom of Western Xia. A Buddhist text there, the Vimalakirti Nirdesa Sutra, found in modern Wuwei, Gansu, shows the hollow, sometimes deformed strokes typical of ceramic type. In 1193 the statesman Zhou Bida printed his own book, the Yutang Zaji, using what he called "clay characters." He credited the movable-type method to Shen Kuo rather than to Bi Sheng directly. Kublai Khan's councilor Yao Shu, who lived from 1203 to 1280, later persuaded his pupil Yang Gu to print language primers with the same ceramic method. Long afterward, the writer Bao Shicheng, who lived from 1775 to 1885, challenged the idea that fired clay type was fragile. Experiments confirmed his claim that it was "as hard and tough as horn," surviving a two-metre drop onto a marble floor without breaking. Chinese ceramic types measured 1 to 2 centimetres long, and the method stayed in use as late as 1844, spanning the Song dynasty through the Qing.

• 4. Wood Type Scales Up

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  Bi Sheng also experimented with wooden movable type around 1040 AD, but abandoned it because wood grain and swelling from ink made the letters uneven. In Western Xia, between 1038 and 1227, printers produced the Auspicious Tantra of All-Reaching Union, discovered in the ruins of Baisigou Square Pagoda in 1991. Many Chinese experts consider it the earliest surviving book printed with wooden movable type. In 1298 the Yuan official Wang Zhen, based in Jingde County, Anhui Province, revived the technique. He carved more than 30,000 wooden types and printed 100 copies of Records of Jingde County, a book of more than 60,000 Chinese characters. Wang Zhen then wrote up his method in a book titled A Method of Making Moveable Wooden Types for Printing Books. He laid out his type on two rotating circular tables, one divided into 24 trays organized by rhyme, the other holding miscellaneous characters. Repeated printing wore down wooden faces faster than metal, so worn characters had to be recarved rather than repaired. In 1322 a county officer named Ma Chengde, working in Fenghua, Zhejiang, made 100,000 wooden types and printed the 43-volume Daxue Yanyi. The technique kept scaling for centuries. In 1733, on the order of the Qianlong Emperor, printers cut 253,500 wooden types and completed the 2,300-volume Wuying Palace Collected Gems Edition within a single year.

• 5. Bronze for Paper Money

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  At least 13 material finds in China point to bronze movable type in use by no later than the 12th century. The Jin dynasty, from 1115 to 1234, and the Southern Song, from 1127 to 1279, both issued large-scale bronze-plate paper currency carrying embedded bronze markers meant to stop counterfeiting. One surviving Jin dynasty note has two square holes for two bronze movable-type characters, each drawn from a set of 1,000 possible characters, so every printed note carried a different combination. A copper-block note dated between 1215 and 1216, held in Luo Zhenyu's 1914 collection Pictorial Paper Money of the Four Dynasties, shows one anti-counterfeiting character, called Ziliao, printed clearly. Its matching character, Zihao, appears as an empty hole where the bronze type had been lost. A similar Song dynasty note in the Shanghai Museum has both marker holes empty for the same reason. Wang Zhen's 1298 book Zao Huozi Yinshufa also mentions tin movable type, likely tried since the Southern Song, but ink would not adhere to it properly. That problem was not solved until the late 15th century, after which bronze became common in Chinese printing. During the Mongol Empire, between 1206 and 1405, the technique spread to the Uyghurs of Central Asia, whose printed pages sometimes mixed in Chinese words, tying the books back to Chinese production. Under the Ming dynasty, the printer Hua Sui used bronze type in 1490, and in 1574 the 1,000-volume Imperial Readings of the Taiping Era was printed entirely in bronze type. In 1725 the Qing government cast 250,000 bronze characters and used them to print 64 sets of the Complete Classics Collection of Ancient China, each set running to 5,040 volumes, for a combined total of 322,560 printed volumes.

• 6. Korea's Bronze Books

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  In 1234, Goryeo dynasty Korea produced the first books known to have been printed from metal type, a set of ritual texts called Sangjeong Gogeum Yemun, compiled by Ch'oe Yun-ui. None of those copies survive. The oldest confirmed metal-type book still in existence is Jikji, printed in Korea in 1377. Research published in 2022 suggests an even earlier candidate. A copy of the Song of Enlightenment with Commentaries by the Buddhist monk Nammyeong Cheon, printed 138 years before Jikji in 1239, may also have used metal type. The Asian Reading Room at the Library of Congress in Washington, D.C. displays examples of this early Korean metal type. The French scholar Henri-Jean Martin described the Korean invention as "extremely similar" to Gutenberg's, though the materials and casting methods the two traditions used differed. Korean founders adapted bronze-casting techniques already used for coins, bells, and statues. The scholar Seong Hyeon, who lived from 1439 to 1504, recorded the process: letters were first cut in beech wood, pressed into a trough of fine sand to form negative moulds, then filled with molten bronze poured from an adjoining trough. A Confucian ban on commercializing printing kept the technology inside the royal foundry, restricted to official state publications, largely aimed at reprinting Chinese classics that Korea's libraries had lost in a conflict in 1126. Whether the technique ever reached Europe remains disputed. The historians Frances Gies and Joseph Gies argued that a Chinese-Korean technique, or at least a report of one, almost certainly traveled west. The historian Joseph P. McDermott countered that no text or physical evidence places any Asian movable type in Europe before 1450.

• 7. Gutenberg's Metal Press

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  A tradition from Feltre and Lombardy credits an Italian engraver, Panfilo Castaldi, who lived from 1398 to 1490, with bringing movable type to Europe after seeing Chinese books said to have been brought back by Marco Polo. By that account, Castaldi printed several wooden movable-type broadsides in Venice in 1426, and Gutenberg's wife supposedly saw Chinese printing blocks there too. The historian Robert Curzon recorded the story from a news article written by a doctor in Feltre in 1843. Henry Yule, who translated Marco Polo's writings and lived from 1820 to 1889, doubted the tale but thought Chinese woodblocks could plausibly have traveled with merchants. What is well documented is Johannes Gutenberg's own work in Mainz, in the Holy Roman Empire. Trained as a goldsmith, Gutenberg already knew how to cut punches for minting coins. Between 1436 and 1450 he built the hardware and casting techniques, centered on a device called the hand mould, that let him produce type from matrices. He and his associates also developed oil-based inks suited to a press, along with the first Latin typefaces. Analysis of the type in his 42-line Bible shows irregularities that ink spread or wear cannot explain, suggesting his casting process may have shifted over time, possibly settling into a standard punch-matrix system only around the 1470s. Gutenberg's alloy of lead, tin, and antimony became the standard type metal for the next 550 years. The high quality and comparatively low price of the Gutenberg Bible, printed in 1455, proved movable type could beat the alternatives. Presses multiplied fast, from a single shop in Mainz in 1457 to 110 presses across Europe by 1480, with 50 of those in Italy alone. Venice became the center of the trade, driven by printers including Nicolas Jenson, Francesco Griffo, and Aldus Manutius. Gutenberg's alloy also had a practical edge over bronze. It melted at a far lower temperature, which made reusable metal matrix moulds far more practical than the expendable sand and clay moulds used in China and Korea.

• 8. Casting, Setting, Decline

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  Cutting a single letter punch in Europe began with a counterpunch, if the glyph had enclosed spaces, carved into carbon steel with a tool called a graver. The counterpunch struck the end of a letterpunch to press recessed counter shapes into the metal. A smoke proof, a temporary print made from candle-soot on the punch, checked progress along the way. Each finished letterpunch struck a soft-metal blank to form a matrix, which then sat in a hand mould while molten type metal, mostly lead and tin with a little antimony, was poured in from above. Antimony expands slightly as it cools, which gave the cast sort, a rectangular block about 4 cm long, sharp edges. Type height varied by country. The Monotype Corporation in London cast moulds at 0.918 inches for Britain, Canada, and the United States, 0.928 inches for France, Germany, and Switzerland, 0.933 inches for Belgium, and 0.9785 inches for the Netherlands. By the end of the 19th century only two typefoundries remained in the Netherlands, Johan Enschede & Zonen and Lettergieterij Amsterdam, and their slightly different heights meant fonts from the two houses could not be mixed without printing too light or too bold. In 1905 the Dutch government's Algemeene Landsdrukkerij standardized on 63 points Didot, a height that was actually Belgium's rather than its own. By the late 19th century, factory-made type was stored in a job case, a drawer about 2 inches high and roughly a yard wide. The California Job Case, named for the Pacific coast foundries that popularized it, became the most common design in America. Capital letters lived in a separate drawer stored above the rest, which is why they are still called "upper case" and the others "lower case." Compositors filled out lines with blank spacer type, including an em space as wide as a capital M and an en space half that width, assembling text with a composing stick into a page image called a forme. Metal type never fully replaced other methods. Large-scale lettering for posters was often cut from wood or ceramic instead, since metal type of that size was too heavy and costly. Images meant to run with text had to be cut as woodcuts or wood engravings at matching type height, or printed separately if made from intaglio copper plates. The 19th-century invention of hot metal typesetting eventually pushed movable type itself into decline over the course of the 20th century.