Same Clay, Two Worlds: The Past and Present of Pottery and Porcelain

On the third floor of the Shanghai Museum's East Building, there is an exhibition hall worth a special visit—the Ancient Chinese Ceramics Gallery. The exhibition unfolds along a timeline, from the first lump of clay shaped by prehistoric hands to the gossamer-thin glazed wares crafted by Qing Dynasty artisans. Each of these objects encapsulates thousands of years of civilizational warmth. After walking through the gallery, many visitors find a quiet question forming in their minds: are those rough, unpretentious earthen jars and the later exquisitely translucent porcelain vases part of the same lineage—grandparent and grandchild—or are they two distant branches that went their separate ways? To address this question, let's begin at the most fundamental level: what precisely distinguishes pottery from porcelain?

I. Not All Clay Is Created Equal

At first glance, pottery and porcelain may appear similar to "fired earth," but they are far more complex than that.

Pottery is made from ordinary clay and fired at relatively low temperatures, roughly between 600 and 1,000°C. For this reason, the body of a pottery piece is not fully sintered — it remains microscopically porous, absorbs water readily, and produces a dull thud when tapped with a knuckle, much like knocking on a mud brick. Prehistoric painted pottery, Han dynasty grey ware, and Tang dynasty sancai (three-color glazed ware) all belong to the pottery family.

Porcelain is a unique material. Its primary raw material is kaolin—a white, low-impurity mineral that can withstand high temperatures. The firing temperature must reach at least 1,200°C for the body to fully vitrify, becoming dense, solid, and nearly impermeable to water. Tap a mature piece of porcelain, and it rings with a clear, bright, metallic note, as though the vessel itself is chiming its thanks to the craftsman. Furthermore, porcelain must be covered in glaze, whose smooth and lustrous surface is a quality pottery can only dream of having.

II. Is Porcelain Simply an "Evolution" of Pottery?

This is precisely the core question that refuses to let go. The answer is yes—but the story is far more complex than the word "evolution" implies.

Porcelain did not appear out of nowhere overnight. It gradually grew out of the technological womb of pottery, nurtured over thousands of years, step by painstaking step. This path of development can be divided into three key stages.

Step One: Glaze—born of a happy accident. During the middle Shang dynasty, when craftsmen were firing impressed hard pottery, ash from burning wood inside the kiln drifted onto the surfaces of vessels and, under intense heat, spontaneously formed a glassy sheen. This was the earliest origin of glaze—not the deliberate invention of some genius craftsman, but a beautiful accident seized upon by an observant mind. From that moment, the technique of glazing gradually moved from the accidental to the intentional.

Step Two: Proto-porcelain—an ambiguous transitional form. During the middle-to-late Shang dynasty, a type of ware appeared that sat somewhere between pottery and porcelain; scholars call it proto-porcelain. Its clay body was more refined than that of pottery, its firing temperature had risen to around 1,200°C, and its surface bore a celadon glaze, giving it something of porcelain's spirit. Yet its water absorption rate remained too high and its sintering insufficient—strictly speaking, it had not yet "graduated" and could only be considered an extended apprenticeship on the long road from pottery to porcelain. This phase stretched from the Shang dynasty through to the Han dynasty—a span of well over a thousand years. This illustrates the slow pace at which history transitions from quantitative change to qualitative transformation.

Step Three: Mature porcelain—finally "fully qualified." In the late Eastern Han dynasty (around the 2nd century CE), the kilns of Yue in Zhejiang province produced what are universally recognized as the first mature celadon pieces, marking the official birth of true porcelain. After thousands of years of technical refinement, the long journey had at last reached its destination.

The path from pottery to porcelain, then, looks roughly like this: accumulated pottery-making experience → accidental discovery of glaze vitrification → continuous refinement of clay body and firing temperature → the long transitional period of proto-porcelain → the arrival of mature porcelain. The intuition I formed while touring the exhibition—that glaze technology and improvements in raw materials were the critical turning points—holds entirely true, with the important addition of "proto-porcelain," a transitional chapter that is all too often overlooked.

III. After the Parting of Ways: Pottery and Porcelain in Their Own Worlds

Once porcelain was invented, pottery did not disappear in humiliation. On the contrary, the two traditions set off down separate craft paths, each commanding its domain for centuries, coexisting and flourishing side by side.

Porcelain: From Yue Celadon to the Reign of Jingdezhen

The moment Eastern Han Yue celadon appeared, it launched the glorious narrative of Chinese porcelain history.

During the Sui and Tang dynasties, the landscape of porcelain was defined by the celebrated division of "celadon in the south and white ware in the north." The celadon of the southern Yue kilns shimmered like "a thousand peaks of jade-green," warm and lustrous as nephrite; the white ware of the northern Xing kilns was pure as snow, praised by contemporaries as "like silver, like snow." The two traditions were evenly matched, together holding up the vault of Tang Dynasty ceramics.

It is also worth noting that the Tang dynasty saw a great vogue for a type of object that is, technically speaking, a low-fired lead-glazed earthenware: sancai (three-color ware). Dominated by yellows, greens, and whites, its glaze flowing and blending in brilliant swirls, sancai was primarily made as burial goods — the final, vivid flare of pottery's brilliance in the Tang era.

The Song Dynasty stands as the aesthetic pinnacle of Chinese ceramic history, arguably the most extraordinary century in the entire story of human ceramics. The Five Great Kilns—Ru, Guan, Ge, Jun, and Ding—each possessed their own supreme technique. Ru ware was celebrated for its "sky-blue after rain breaks through cloud" glaze color; fewer than a hundred pieces survive, each one beyond price. Jun ware was prized for its yaobian (kiln transformation) glazes: a piece enters the kiln one color and emerges a thousand colors—every single object is unique. Dingware's finely carved white porcelain earned praise: "Ding Prefecture's carved porcelain, chiseled red jade." Song dynasty literati favoured an aesthetic of restraint and understatement, and this sensibility profoundly shaped the spiritual character of Song ceramics: unshowy, yet resonant with a depth that lingers long after the eye has moved on.

In the Yuan dynasty, Jingdezhen burst onto the scene in a manner that rewrote ceramic history outright—blue-and-white porcelain was born. Using cobalt pigment to paint on a white porcelain body, covering it with a transparent glaze, and firing it at high temperature, the resulting blue-and-white pattern—fresh, elegant, and full of life—opened up a craft tradition that has continued unbroken to this day.

During the Ming and Qing dynasties, Jingdezhen became the undisputed "Porcelain Capital." Its imperial kilns gathered the most skilled artisans in the realm and pushed ceramic craft to its absolute limits. The delicate refinement of Chenghua doucai (contrasting colors); the exuberant complexity of Wanli wucai (five colors); the opulent precision of Qing dynasty falangcai (enamel colors); the soft, painterly tenderness of Qing dynasty fencai (famille rose)—each technique is a summit that seems impossible to surpass. Particularly during the Yongzheng and Qianlong reigns, the standards of imperial porcelain approached what can only be called a breathtaking craft obsession: eggshell-thin vessels through which a finger's shadow could be seen in transmitted light and revolving-interior bottles (zhuanxin ping) with inner and outer layers that rotated independently. The craftsmen appeared to be in an argument with the laws of physics.

Pottery: Out of the Mainstream, Into Its Own Realm

Even as porcelain gradually began to dominate, pottery did not fade into silence. Instead, in several distinctive niches, it found its own magnificent voice.

Zisha ware represents the most unexpected and spectacular reinvention pottery has ever undergone. From the mid-Ming Dynasty, the zisha (purple sand) stoneware of Yixing in Jiangsu Province, with its distinctive breathability and heat-retention properties, found a perfect partner in Chinese tea culture and rapidly became the cherished possession of scholars and refined gentlemen. Yixing teapots carry no glaze and no painted decoration; their beauty lies entirely in their form and in the unadorned, intrinsic quality of the clay itself. Generation after generation produced celebrated masters—Gong Chun, Shi Dabin, Chen Mingyuan, and Chen Mansheng—and each famous teapot is an artwork to be handled, used for brewing tea, and passed down through the ages. Literati even inscribed poems and maxims on their teapots, so that zisha ware came to occupy a dual identity as both functional object and literary artifact—something genuinely rare in the entire history of material culture.

Architectural ceramics constitute another quietly flowing tributary. The roof tiles of the Qin and Han dynasties, the brick carvings of the Wei and Jin periods, the glazed building components of the Ming and Qing — all are brilliant expressions of pottery craft in the realm of architecture. The magnificent golden-glazed tiles of Beijing's Forbidden City are, in essence, a form of low-fired lead-glazed earthenware, operating within a completely different technical system from the high-fired porcelain of Jingdezhen—yet they command an equally profound admiration.

IV. Conclusion: From the Same Root, Each Magnificent in Its Own Way

Return, in your mind, to that dazzling exhibition at the Shanghai Museum. When you stand once again between a prehistoric earthenware jar and a Qing Dynasty famille-rose vessel, you may find yourself touched by a different kind of feeling: those objects that seem worlds apart actually share the same long technological memory.

Pottery is the starting point—the first meeting of fire and clay. Porcelain is the qualitative transformation and transcendence that emerged from thousands of years of pottery's accumulated wisdom. The relationship between them is not a simple story of "replacement." It is more like two great trees grown from the same root, each putting forth its branches and leaves in its own particular soil.

The conversation between clay and fire has continued in China for twenty thousand years. It is not yet over.