What is the predecessor experience of photography montage?

German photographer john heartfield (189 1 ~ 1968) is a master of photography montage. Hatfield lost his father when he was a child and lived a miserable life. Later, through hard work, she was admitted to Munich Art School at the age of 16, and continued to receive art education in Charlottenburg. Hatfield worked as an advertising painter, art teacher, cover designer and stage art designer, and made great achievements in painting, sculpture and art design, but what really made him famous was photography montage. Photographic montage is photo editing. As a kind of photography technology, it was popular in the 1920s and 1930s, and was widely used in artistic expression, publishing design and advertising production. Hatfield's real name, Helser Feld Holmut, was changed to an English name like john heartfield to show his contempt for the German Empire. During World War I, hatfield, who served in the German army, made postcards with his friends to communicate with each other in order to avoid the postal inspection in wartime. This is the predecessor of photographic montage.