Metallurgy
This ancient culture had remarkably advanced bronze casting technology which was acquired by adding lead to the usual combination of copper and tin creating a stronger substance that could create substantially larger and heavier objects; for instance, the world's oldest life-size standing human statue (260 cm high, 180 kg), and a bronze tree with birds, flowers, and ornaments (396 cm), which some have identified as renderings of the fusang tree of Chinese mythology.
The most striking finds were dozens of large bronze masks and heads (at least six with gold foil masks originally attached) represented with angular human features, exaggerated almond-shaped eyes, some with protruding pupils, and large upper ears. Many Sanxingdui bronze faces had traces of paint smears: black on the disproportionately large eyes and eyebrows, and vermillion on the lips, nostrils, and ear holes. interprets this vermillion "not be coloring but something ritually offered for the head to taste, smell, and hear (or something that gave it the power to breathe, hear, and speak)." Based upon the design of these heads, archeologists believe they were mounted on wooden supports or totems, perhaps dressed in clothing. concludes "masked ritual played a vital role in community life of the ancient Sanxingdui inhabitants", and characterizes these bronze ritual masks as something that may have worn by a shi 尸 (lit. "corpse") "personator, impersonator; ceremonial representative of a dead relative".
The shi was generally a close, young relative who wore a costume (possibly including a mask) reproducing the features of the dead person. The shi was an impersonator, that is, a person serving as a reminder of the ancestor to whom sacrifice was being offered. During such a ceremony, the impersonator was much more than an actor in a drama. Although the exact meaning may have been different, the group of Sanxingdui masked figures in bronze all have the character of an impersonator. It is likely the masks were used to impersonate and identify with certain supernatural beings in order to effect some communal good.
Another scholar compares these "bulging-eyed, big-eared bronze heads and masks" with "eye-idols" (effigies with large eyes and open mouths designed to induce hallucinations) in Julian Jaynes's bicameral hypothesis; and proposes, "It is possible that southern Chinese personators wore these hypnotic bronze masks, recursively representing the spirit of a dead ancestor with a mask that represents a face disguised by a mask."
Other bronze artifacts include birds with eagle-like bills, tigers, a large snake, zoomorphic masks, bells, and what appears to be a bronze spoked wheel but is more likely to be decoration from an ancient shield. Apart from bronze, Sanxingdui finds included jade artifacts consistent with earlier Chinese neolithic cultures, such as cong and zhang.
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