 This set of small tools would then be used by the small hands to build and operate ten sets of one-sixteenth-scale hands and tools, and so forth, culminating in perhaps a billion tiny factories to achieve massively parallel operations.He uses the analogy of a pantograph as a way of scaling down items.This idea was anticipated in part, down to the microscale, by science fiction author Robert A. Heinlein in his 1942 story "Waldo".