"Grape Cluster" is one of the most influential forms in the history of Yixing purple clay development. "Grape" means "clustered and piled together," and the form resembles many spherical and hemispherical shapes stacked together. Shao Daheng's "Grape Cluster" is the most renowned in purple clay history. Gao Si praised it in *Teapot Appreciation*: "His grape cluster teapot, from neck to body, has well-proportioned structure, appreciated by both refined and common tastes... The spout extends naturally, as if born that way... The lid fits straight and tight, so when tilted there is no worry of the cap falling off... The air hole is small on the outside and large on the inside, shaped like a trumpet, so there is no problem of blockage... Others cannot replicate it." Gu Jingzhou's "Grape Cluster" was greatly influenced by Shao Daheng: > Through my decades of study, I feel that his (Shao Daheng's) various traditional vessels can be called a culmination of the art of purple clay, sweeping away the delicate and ornate style of an era. From his refined selection of clay, the profundity of his aesthetic in form, the perfection of his creative expression, and his superior technique, he gained widespread acclaim at the time. His reputation was so high that it could be said "none came before, none will come after."[1] --- [1] Gu Jingzhou: "Overview of Yixing Purple Clay Art," in *Purple Clay Through the Seasons*, edited by Dai Zhongjun and Sheng Pangsong (Shanghai: Wenhui Publishing House, October 1991), p. 174.