Chao Po-chu was a member of the Sung Imperial house, being descended in the seventh generation from T'ai-tsu emperor. He excelled at painting landscapes, figures, and architecture, but was also competent in bird and flower paintings. He painted his figures with moist brush and was able not only to portray his subjects with fresh charm but also with accurate grasp of their characteristics. This painting shows a lohan sitting cross-legged on a rug, expounding scripture. Below is kneeling an ocean spirit wearing both sword and bow who has come to attend the ritual. In the foreground is a magic vessel offered by the ocean spirit. From a vase on the table emanates incense smoke, which rises into mid-air and reveals heavenly palaces and halls. The age of the silk makes the picture dark and somewhat unclear. However, the figures are painted with such vigour of stroke and the colors possess such calm and purity that the essential spirit of the work remains unimpaired.