Epitaxial assembly of toric focal conic domains (TFCDs) of smectic-A (SmA) liquid crystal molecules on SU-8 square pillar arrays. Background is the Maltese cross pattern observed in polarized optical microscope, representing the square array of TFCDs. Figure credits: Apiradee Honglawan, Daniel A. Beller, Marcello Cavallaro, Randall D. Kamien*, Kathleen J. Stebe, and Shu Yang.