It has two chambers one filled with air, when placed into a book it is flattened by the weight of the book, squeezing the air into the opposite chamber.
When you are wanting to continue reading, by squeezing the exposed chamber it inflates the chamber inside the book and so opening the page enough to slide your finger in.
Designers: Jung-Hyun Lee, Won-Sik Chae and Rhea Jeong
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