Scientists have long dreamed of creating synthetic structures out of the same raw material that nature uses in living systems—proteins—believing such an advance would allow for the development of transformative nanomachines, for example, molecular cages that precisely deliver chemotherapy drugs to tumors or photosynthetic systems for harvesting energy from light. Now a team of biologists from The University of Texas at Austin and the University of Michigan have invented a way to build synthetic structures from proteins, and just as in nature, the method is simple and could be used for a variety of purposes.