The Museum's Department of Asian Art recently acquired a gold stem cup of complex origins (Figure 1). While related stylistically and iconographically to Chinese works attributed to the Tang dynasty (617–906), this goblet is clearly also indebted to the cultures of Tibet and Central Asia, and as such has been attributed to the region of Xinjiang, modern China's most northwestern province, and dated to the late seventh to eighth century, when Tibet dominated much of northern Central Asia.

The cup is small, less than nine centimeters in height, but with a weight of 171.8 grams, it is surprisingly heavy for its size. The exterior is decorated with extremely well-executed repoussé: twelve Chinese zodiacal animals occupy the horizontal band that encircles the mouth, while the remaining surface is enriched with stylized vine scrolls inhabited by beasts, both real and mythical. The background is textured with systematic ring punching that further enhances the vessel's expressive energy. With its bell-shaped body, slender stem, and flared foot, the cup's form reflects contemporary Chinese works, as illustrated by a cast, gilded bronze cup with simple incised decoration in the Museum's collection (Figure 2). Similar Tang cups, both cast and worked, are known in silver as well.

As evidenced by the quality of its decoration, the cup was obviously made for a wealthy and discerning patron. This assumption is supported by the lavish use of gold, which at the same time suggests a non-Chinese provenience, since ancient Chinese gold vessels are rare and extant examples tend to be flimsy. It is these seemingly incongruous characteristics, in addition to puzzling details of manufacture, that present interesting questions involving the interplay between the styles and techniques of different cultures.

The cup is constructed from five separately manufactured elements: the decorated bowl and its plain liner, the decorated stem with intermediate knop and flared foot, the foot's lining, and on the underside of the exterior bowl, a squat, cylindrical drum (Figure 3). The bowl and liner were soldered together at the rim of the cup, and what would otherwise be a conspicuous seam is hidden behind a single row of granulation, visible only where some granules have been lost (Figure 4). The flared foot is soldered to its liner in a similar manner, with the latter extending just high enough to reach the lower edge of the knop.

The stem and its appurtenances are technically the most striking elements of the cup assembly. The interior of the hollow stem is visible from the underside of the foot, although due to its small diameter it is quite difficult to inspect. The presence of a vertical lap join, which can be seen in the radiograph (Figure 3), indicates that the foot was fabricated rather than cast or raised, and upon close examination the edges of the outer sheet can be discerned on its surface (Figure 5). The stem is not actually joined to the underside of the external bowl, but instead is soldered where it pierces the drum, which in turn was joined along its upper circumference to the bowl.

From a structural point of view this is by no means an ideal arrangement, as the flat sheet that forms the bottom of the drum could easily be deformed when the cup was subjected to mechanical stress, and despite the deeply embossed lotus petals, which helped to stiffen the drum by virtue of their radiating pleats, the goblet has indeed become distinctly lopsided. An inverted, truncated cone or similar shape would have been a better choice for the transitional element between stem and vessel, an arrangement that can resist deformation far more successfully. Still, these structural problems could have been mitigated had the stem been soldered directly to the bowl.

In pre-industrial societies soldering has always presented some technical difficulties. Soldering in early times necessitated heating what was essentially the entire object, whether in an enclosed muffle furnace or on an open brazier. Unlike modern metalworkers who use soldering torches that combine copious heat with pinpoint accuracy, ancient goldsmiths had inadequate means to direct heat to where it was required, and had no way of judging the temperature other than actually watching the solder melt. The practical implications of these limitations are illustrated in the way the assembly of the cup was resolved. Because the drum was made as a separate element, rather than raised with the exterior bowl, the join between the stem and bowl would not have been visible during the soldering process. As a consequence, the artist decided not to solder the stem to the bowl. He must have considered "blind" soldering too great a risk, for if overheated, the cup—and with it, all labor invested thus far—could have collapsed and eventually melted.

The design of the cup, however, did force the goldsmith to take a similar risk, as he had to apply the extensive repoussé decoration to the outer bowl, the drum, and the foot before soldering the different elements together. This procedure is unusual in virtually all pre-industrial cultures, past and present. When problems of access demand that the decoration be executed first, joins made subsequently are usually mechanical, as the dangers inherent to the soldering process are too great. To judge from the quality and successful execution of the work, the artist certainly had superb technical skills, but still one might ask why such a technically demanding design, which so tested these skills, was chosen for this cup.

Surprising solutions and hybrid forms are to be expected at the interface of disparate cultures. In the case of the gold stem cup, where a highly skilled goldsmith applied his craft to a foreign visual vocabulary, a conspicuous disjunction between Chinese style and Central Asian solutions can be observed. Western China is one of many regions on the Eurasian continent where sedentary and nomadic societies of various ethnicities produced complex works reflective of multiple influences and origins.

Since the acquisition process allows only a relatively brief assessment of a work of art, further investigation aimed at placing the cup within this continuum still remains to be undertaken. As future studies of silver Tang Dynasty hollowware provide crucial information about early Chinese techniques of working and joining precious metal sheet, the influence of these manufacturing traditions in Central Asia can be evaluated through comparison with new finds from this region. Together these insights should make it possible to recognize with greater assurance the contributions of the different cultures, and to better characterize the relationship between style and technology.

The Stem Cup is featured in Recent Acquisitions, A Selection: 2001–2002, MMA Bulletin 60 (Fall, 2002) p. 53. It can be viewed in the new installation, "Glimpses of the Silk Road: Central Asia in the First Millennium."

Richard E. Stone has been a conservator in the Sherman Fairchild Center for over twenty-five years. He specializes in the examination of metal objects and supervises the department's technical vetting of objects for acquisition by the Museum. His major research interest has been the technology of Renaissance bronze statues, especially as related to connoisseurship, and he has written on the casting technique of Donatello and the Mantuan sculptor Antico, among other topics. He regularly teaches a course on technical considerations for the art historian at the Conservation Center of the Institute of Fine Arts, New York University.