Kuncan (1612–1673), also known by his monastic name Shi Xi, was a preeminent monk-painter and one of the "Four Monk Masters" of the early Qing Dynasty. His masterpiece, "Stream and Mountain in Autumn Rain" (Xi Shan Qiu Yu), is a profound expression of his individualist spirit. As a Ming loyalist who sought spiritual asylum in the Buddhist monkhood after the fall of his dynasty, Kuncan found in the autumnal landscape a poignant metaphor for reclusion and the transience of life.

The aesthetic essence of this work is defined by the concept of "Cangmang" (vast, hazy, and vigorous). Unlike the "cold and sparse" aesthetic of his contemporary Hong Ren, Kuncan’s vision of the autumn rain is one of density and untamed energy. In "Stream and Mountain in Autumn Rain," he captures the atmospheric weight of the season, where the mountains are not static but seem to breathe through the shifting mists and moist vegetation characteristic of the Nanjing region where he resided.

In terms of artistic technique, Kuncan was a master of the dry-brush (ganbi) and layered ink (jimo) methods. He utilized coarse texture strokes (Cun-fa) and intricate "rubbing" brushwork to build up the rugged surfaces of the rocks. By repeatedly applying layers of ink, he achieved a sense of tactile volume and three-dimensional depth. This "thick and heavy" approach allows the texture of the paper to interact with the ink, creating a sense of shimmering light and pervasive dampness that perfectly mimics the effect of autumn rain on the earth.

The compositional structure of the scroll is a sophisticated study in verticality and narrative. Winding streams lead the viewer’s eye past hidden temples and hermitages tucked into the ravines, upward toward the mist-shrouded peaks. The autumn rain is not depicted with literal lines but is felt through the blurred tonalities and the overlapping mountain forms. This "mental landscape" (xinxiang) reflects Kuncan’s own life as a Zen practitioner, where the external scenery serves as a mirror for internal quietude and moral clarity.

Historically and philosophically, "Stream and Mountain in Autumn Rain" stands as a landmark of Individualist painting in 17th-century China. Kuncan’s sincere and robust approach to nature—grounded in his own wanderings—marked a departure from the Orthodox school’s rigid imitation of the past. His innovative textures had a profound influence on modern landscape masters, most notably Huang Binhong. Today, the painting is celebrated for its psychological depth and its ability to transform a seasonal theme into a powerful individualist statement on identity and survival.