Frustum Example (IMAGE) Duke University Caption The area shown to be vulnerable to attacks in new research stretches out in front of a camera’s lens in the shape of a frustum — a 3D pyramid with its tip sliced off. Credit Spencer Hallyburton, Duke University Usage Restrictions None License Original 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.