Yen ma

Yen ma aeolian chime of China, a “mobile” of small plaques of metal, stone, or glass, suspended by silk threads from roofs or over windows and doors. Called yü k'o in ancient times, now also known as t'ieh ma (142). Moule, A. C. “A List of the Musical and Other Sound-producing Instruments of the Chinese,” in Journal of the North China Branch of the Royal Asiatic Society, Vol. 39. London, 1908.