A staff member prepares boxes for bark paintings, which will be shipped to China for exhibition, at the National Museum of Australia in Canberra, Australia, on May 3, 2018. An "Old Masters" art exhibition of the National Museum of Australia featuring over 100 bark paintings will tour to China next month. The historic journey to China marks the first time most of these artworks have left the country. (Xinhua/Xu Haijing)