This question already has an answer here:

What is the purpose of chains hanging from the book shelves of libraries in the Citadel and Castle Black in Game of Thrones?

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merged by Napoleon Wilson Oct 31 '18 at 19:46

This question was merged with What is the purpose of the chains hanging from the shelves at the Citadel? because it is an exact duplicate of that question.

  • Definitely a duplicate, the answer on the other question even uses the same paragraph from wikipedia that my answer does. – sanpaco Oct 31 '18 at 19:07

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