The Rochester Cloak (IMAGE) University of Rochester Caption University of Rochester Ph.D. student Joseph Choi is pictured with a multidirectional "perfect paraxial" cloak using four lenses. Credit Adam Fenster / University of Rochester Usage Restrictions None 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.