Geometrically-frustrated wrinkle patterns 3: Experimental realisation of defect patterns

In the previous talks, the role of geometry in forcing the creation of defects in wrinkle patterns has been discussed. Here, we present a series of experimental systems that exhibit different mechanisms for introducing new wrinkles, including smooth cascades and localised defects. We discuss the influence of the underlying preferred wrinkle pattern on which of these mechanisms is observed in reality. (This is part 3 in a 3-talk series).