The self-assembly process described in Nature commences with chain-like macromolecules, so-called triblock terpolymers composed of three linear sections connected to form a chain-like structure A-B-C or A-D-C. The block in the middle has been marked green or black, respectively. Block A (gray) has to interact with other particles; block C (rose) is a corona controlling solubility. By way of self-aggregation the macromolecules formed nanoparticles, which by way of co-aggregation formed the next higher level in the hierarchy. This way a co-assembled superstructure develops, for which Müller's research team has coined the term "caterpillar micelles."