Three-dimensional scenes inside the book
"Tunnel books date all the way back to the mid-18th century, when they were originally called "peep shows." The concept of tunnel books was inspired by theatrical stage sets. If you've ever witnessed a live play with movable set pieces, it's easy to see how they inspired tunnel books. Tunnel books are "read" through a hole in the cover. Each page features openings that allow the reader to see through the entire book to the back cover. The images on each page work together to form a three-dimensional scene inside the book that helps to tell the story."
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