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Light and Darkness is a 1917 novel by Japanese author Natsume Sōseki. It is an unfinished work, as Sōseki died before completing it. The novel is highly acclaimed and is considered one of Sōseki's masterpieces. It tells the story of a young man named Naosuke who is struggling to find his place in the world. The novel explores themes of alienation, identity, and the search for meaning in life.