If a clear border between documentary and narrative movies exists. I think it lies between the fictional film Treeless Mountain and the documentary The Story of the Weeping Camel. Both of these films unfold quietly and delicately at their own pace.
The world of Treeless Mountain is so enveloping and complete, and the are scenes so precisely selected. It manages to use mood, delicate as a leaf’s skeleton, as the storytelling engine of the movie. Which is a nearly impossible task to accomplish or explain.
Treeless Mountain Trailer:
Here is the director So Young Kim talking a little bit about the making of the movie: