To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie S5. A honeycomb lattice can support clockwise (left) or counterclockwise (right) propagating modes depending on the degree of deformation. When all angles of the lattice are 90°, there is no band gap and there are no edge modes. 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 »