Figure 6.

Another example showing the sensitivity of the preferential directionality of an interfacial waveform in a hexagonal lattice on spinners, containing a subdomain where the spinners rotate in the opposite direction to those in the ambient medium. The radian frequency of the applied displacement is (a) ω = 3.8 and (b) ω = 4.0 (see also figure 2f ). As in the previous simulations, the absolute value of the spinner constant is |α| = 0.9 throughout the domain. (Online version in colour.)