What is the theme of "The Twenty-One Balloons"?

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There is more than one theme present in this book. The majority of the book is about the Professor's time on the island of Krakatoa, its incredible population of people, and the society that they have built. They have more or less built a utopia on a volcanic island, and they have managed to keep it a secret. The people on the island are all incredibly intelligent and hardworking people, and this shows off a theme that emphasizes the importance of education. Additionally, the people are not selfishly using their ingenuity and hard work. The community is exceptional for their altruistic behavior. This book shows young readers a wonderful theme about community and the importance of helping out your neighbors. Creativity and individualism are also emphasized in this book. The island...

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