Literature Reference: The bells resound, the zithers play, the sheng and qing harmonize. Source from 'The Book of Songs, Xiao Ya, Gu Feng Zhi Shi, Gu Zhong'.
笙: The instrument, typically crafted from thirteen bamboo pipes of varying lengths, is a traditional Chinese wind instrument.
磬: Emptiness, fulfillment.
Meaning: The sheng and qing harmonize, symbolizing harmony and mutual understanding between people.