Roof-tiles in imperial China: Creating Ximing Temple’s lotus-pattern tile ends

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Any visitor to China will have noticed the spectacular roofs on buildings dating from imperial times. However, the question of how these roof tiles were produced has attracted relatively little attention from archaeologists. Now, a team of researchers has conducted a major study of tile ends unearthed at the Ximing Temple in Xi’an, yielding exciting insights into their production.

Roof-tiles in imperial China: Creating Ximing Temple's lotus-pattern tile ends
Incisions on the back surfaces of tile ends and patterns on the front surfaces. Artisans firmly joined
tile ends to imbrices through a process which left obvious traces on the back surfaces of the tile
ends. Tile ends with simple petals mostly contain thin, radially oriented scratched incisions
 (Fig. 3.1), while those with compound petals usually contain wide, triangular-shaped
curved incisions (Fig. 3.2). The correlation between pattern and processing technique
identifies two production systems at the Ximing Temple workshop
[Credit: Kanazawa University]

In a study published in Archaeological Research in Asia, researchers from Kanazawa University and the Chinese Academy of Social Sciences have revealed the significance of minute variations in the tile ends used in the roof of the famous Ximing Temple in Xi’an, built during the Tang dynasty (618-907 AD) when Xi’an (then known as Chang’an) was the imperial capital.




The researchers conducted an investigation of 449 tile ends with lotus patterns from various periods during the Tang dynasty that had been recovered from the Ximing Temple. “We were interested in the variations in the tile ends, both those within the conscious control of the artisans who made the tiles, such as whether to use simple or complex lotus patterns, and those outside their control, such as the marks left by the deterioration of the molds used to make the tiles,” says lead author of the study Meng Lyu.

Roof-tiles in imperial China: Creating Ximing Temple's lotus-pattern tile ends
Basic information about tile ends and imbrices. The figure shows the structure of a tile end
and how tile ends and imbrices are used [Credit: Kanazawa University]

“We discovered that the degree of minor variation in the tile ends increases significantly in the later samples,” adds author Guoqiang Gong. “This suggests to us that there was a shift away from the centralized manufacturing of imperial building materials during the Early Tang period toward one in which small private artisans played an important role in the Late Tang period.”




Intriguingly, the study has revealed traces of the coming together of two distinct cultural traditions. “We found that there were, in fact, two separate production systems at work to make the title ends,” notes author Chunlin Li. “One produced tile ends with compound petal patterns and curved incisions, whereas the other made end tiles with simple petal patterns and scratched incisions.” These two styles may ultimately have their origins during an earlier historical period when the Northern Wei dynasty was divided into two regimes on either side of the Taihang mountain range.

Roof-tiles in imperial China: Creating Ximing Temple's lotus-pattern tile ends
Shaping stage in production process of tile end. The shaping stage in tile-end production process is
 most likely to have followed this sequence: 1. Design; 2. Making first-level mould; 3. Making
ceramic second-level mould; 4. Making tile end. The use of two different levels of mould
enabled artisans to produce the needed numbers over a relatively short period of time
[Credit: Kanazawa University]

This study demonstrates that studying the roof tiles of China’s grand imperial buildings can reveal a great deal about the circumstances of their production and yield insights into larger historical questions.

Source: Kanazawa University [March 16, 2021]

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