comprised of silica microspheres with tailored attractive interactions between them have been directly assembled via a robotically controlled deposition technique. 3D periodic lattices, whose periodicity far exceeds the dimensions of the colloidal building blocks, have been created through layer-by-layer patterning of parallel rods. (J. A. Lewis et al., September 16, Adv. Mater. 2002, 14, 1279-1283)