The constant conversion of fuels to drive the function of molecules has also been applied to the self-assembly of small molecules. In such a chemically fueled system, molecular assembly is regulated by a fuel-driven reaction cycle that comprises at least two reactions, i.e., an activation and deactivation reaction. In the activation reaction, a precursor reacts with a chemical fuel which activates it for self-assembly. In the deactivation, the activated product spontaneously reverts to the precursor. In its finite lifetime, the activated product can be temporarily part of a dynamic assembly which is thus regulated by the kinetics of the reaction cycle. This strategy has resulted chemically fueled dynamic fibers , droplets , colloids , and small molecular machines . Developments in chemically fueled self-assembly have resulted in fast reaction cycles in which activated products have half-lives in the range of tens of seconds. Nevertheless, the field of chemically fueled self-assembly of small molecules still lacks precision and designability when compared to DNA nanotechnology.