When you flip open the cover of an unfamiliar book, you're never quite sure what you're going to find inside. It might be a great story, it might be some new information, or it just might be something that changes your entire perspective.

Whether it was a novel, a biography, a reference book, or even a textbook, we want to know about the book that forever changed how you saw the world. Tell us what the book was and just how it shifted your perspective in the comments now.

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Image: Trinity College Library / Sam.