Kirigami with Gravitation (IMAGE) University of Pennsylvania Caption Wang and the Kamien lab collected the largest books they could find from across the physics department. They found that seven copies of the five-pound 'Gravitation' textbook could be supported by a single kirigami sheet. Credit Image: Randall Kamien Usage Restrictions Please include appropriate credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.