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I read a book where the "Earth" (another planet) is hollow on the inside, and all the people walk around on the inside of the shell. There is a large bright light in the centre of the planet (like the sun) and the people are trying to work out where they are - trying to understand their world.
I've got no idea what the book is called, but if you try it on Name That Book thread, someone is bound to know. I think it was written in the 70s. I can still remember it quite vividly.
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