What is the fine-grained topic of the following text: This exhibition at the J. Paul Getty Museum, entitled Japan's Modern Divide: The Photographs Of Hiroshi Hamaya and Kansuke Yamamoto, presents the work of these two photographers whose careers spanned much of the twentieth century, or the Showa Era (1926–1989) as it is known in Japan. Only return the topic.
"Japan's Modern Divide: The Photographs Of Hiroshi Hamaya and Kansuke Yamamoto" exhibition at the J. Paul Getty Museum