Archaeologists at a royal Zhou Dynasty site in Shaanxi Province have discovered a specialized architectural wing dedicated to the calibration of ceremonial bronze bells (bianzhong). The chamber contained a cache of small, precision-crafted bronze hammers and files, along with clay tablets documenting the specific 'strike-point' adjustments required to achieve perfect pentatonic intervals.
The find provides a rare look at the acoustical science of early China, where the tuning of ritual instruments was a matter of state importance, believed to maintain cosmic harmony. The presence of 'toning-tools' still resting next to unfinished bells suggests the workshop was abandoned suddenly, preserving the 3,000-year-old secrets of the imperial music-masters.