To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie S4. The direction of propagation of edge modes can be controlled by the geometry of the lattice. An excitation propagating clockwise propagates counterclockwise when the unit cell of the lattice deforms from a hexagonal to bow-tie shape. 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 »