To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie S1. Demonstration of unidirectional waveguide modes in experiment: A single edge gyroscope is excited for five periods at a gap mode frequency. This causes clockwise propagation around the edge. Topological mechanics of gyroscopic metamaterials Lisa M. Nash, Dustin Kleckner, Alismari Read, Vincenzo Vitelli, Ari M. Turner, and William T. M. Irvine PNAS. 2015. DOI: 10.1073/pnas.1507413112 Download Original Video Browse All Videos »