Smoky Boats on Stream and Mountains (溪山烟艇图) is a quintessential landscape masterpiece by Tang Di (唐棣), a prominent professional painter of the Yuan Dynasty. Tang Di, a native of Huzhou, was a favored artist in the court of Emperor Wenzong and a devoted follower of the Guo Xi school of landscape painting. This work represents the peak of his ability to blend the Northern Song monumental style with the more intimate, lyrical sensibilities of the Yuan era.

The composition of the painting is a classic example of the "level distance" (平远) perspective. In the foreground, gnarled pine trees with "crab-claw" branches—a signature of the Li-Guo tradition—stand tall against the mist. The middle ground features winding streams and small boats (the "smoky boats" of the title), where scholars and fishermen engage in quiet contemplation. The background dissolves into lofty mountains shrouded in ethereal mist and clouds, creating a profound sense of atmospheric depth.

Technically, Tang Di’s brushwork is exquisite and disciplined. He utilizes "cloud-head" texture strokes (卷云皴) to give the rocks and mountains a rhythmic, organic volume. The ink wash is applied with subtle gradations to simulate the damp, heavy air of a river scene at dawn or dusk. Unlike many of his contemporaries who leaned toward radical literati amateurism, Tang Di maintained a professional precision that preserved the grandeur of the Song Academy while infusing it with the poetic stillness favored by Yuan intellectuals.

The artistic significance of this scroll lies in its role as a bridge. It demonstrates how the monumental landscape tradition was reinterpreted under Mongol rule. By depicting the "seclusion" of the smoky stream, Tang Di reflects the literati's psychological retreat into nature. This painting is not merely a depiction of scenery but a spiritual sanctuary captured on silk, emphasizing the harmony between the human spirit and the vast, shifting movements of the natural world.

Today, Smoky Boats on Stream and Mountains is regarded as an essential study for understanding the evolution of Chinese landscape painting. It remains a testament to Tang Di's technical mastery and his ability to capture the "spirit resonance" (气韵) of the Jiangnan landscape through the lens of a classical Northern aesthetic.