To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie S2. A single edge gyroscope is excited for five periods at a frequency that is not in the gap. This does not result in an excitation that propagates 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 »