Chang Shana at the exhibition opening at the Tsinghua University Art Museum on July 15.[Photo provided to China Daily]

After his death, Chang Shuhong was buried in Dunhuang. His grave faces Jiucenglou (Nine-story Building), a landmark structure at the Mogao Caves. He painted the building in 1952, and this work is also on display at the Tsinghua University Art Museum.

At the end of the exhibition, there is a whiteboard mounted on the wall where visitors can leave comments. Chang Shana was the first one to write down her feelings at the exhibition's opening.

She writes: "Dear dad, all my life I've been following your instructions to promote Dunhuang's art and culture, and help integrate them into people's lives. Today, it feels like we are meeting again!

"Please rest assured, because a lot of people in this country pay attention to and deeply love Dunhuang, and they will work together to restore it to its former glory as a jewel on the Silk Road."