The rules governing the formation of crystals have been studied for centuries. However, many unknown factors remain, making it still difficult to predict crystallographic structures and their morphologies as well as the relationship between them. Differently shaped micro-and nanostructures having complex morphologies can emerge from the same molecules. One fascinating phenomenon in crystallography is the combination of a continuous crystallographic structure (= single crystal) with distinct sub-units at the morphological level. A multidomain structure suggests the presence of grain boundaries formed by fusion, for example, which for single crystals does not readily occur. The formation and existence of such multidomain single crystals remain an enigma.