In the 10th to 13th century it became more refined.
After that it was rooted in tradition and lacked innovation.
In China, two of the most important bodhisattvas are Avalokiteshvara (Guanyin), the embodiment of the virtue of compassion, and Manjushri (Wenshu), the personification of profound spiritual wisdom.
By the tenth century, both were understood to be able to manifest in a range of forms; Avalokiteshvara sometimes took the form of a woman, which helps to explain the early Western perception of this divinity as female.
Her head, encircled by a halo, is slightly tilted, intent on catching the smallest plea for help.