Along the watermill corridor in Thunda village, river water turns a succession of mills. A September 2026 Lhasa report places this scene in Thonpa, Nyemo County, where incense production connects running water with the preparation of fragrant materials. The machinery makes one relationship visible: the workshop draws power from the valley around it.
A mill belongs to a larger sequence of work. Grinding changes the condition of an ingredient so it can be used in a mixture, but incense also depends on identifying materials, preparing them and judging the paste. Water supplies motion; the maker supplies decisions that a turning wheel cannot make.