Abstract

The article describes a rarely mentioned and discussed method of explication first found in Chapter six of Descartes’s posthumously published _The World_ (_Le Monde_), where he uses a fictitious cosmological narrative to develop an account of our material universe and its laws. The assumption of such an approach is that the thing’s structure (nature) can be revealed by its genesis (its producibility), even if the latter is fictitious, or rather, precisely _because_ it is fictitious. This method of “genetic epistemology” turns out to be surprisingly influential: it is found, for example, in Rousseau’s reflections on the state of nature, but also in commentaries on Descartes’s philosophy – e.g. in Martial Gueroult’s principle of “the order of reasons”.