In One Hundred Rhyming Couplets as My Letter to Weizhi (Daishu Shi Yibaiyun Ji Weizhi), Tang dynasty poet Bai Juyi wrote: Sitting happily and close together, many toasts are made from elegant wine cups. Fragrances waft while singing and dancing, a hairpin drops and is lost. Playing with the red shell bowl, drinking wine from white jade cups. This Song dynasty cup is made of natural shell. It has the color and shine of a natural pearl.