 A standard philosophical definition of “artifact”—often assumed even when not explicitly stated—is that artifacts are objects made intentionally, in order to accomplish some purpose (Hilpinen 1992; 2011). This definition is rooted ultimately in Aristotle’s distinction between things that exist by nature and things that exist by craft (Metaphysics 1033a ff., Nicomachean Ethics 1140a ff., Physics 192b ff.). Those that exist by nature have their origin in themselves, whereas those that exist by craft have their origin in the craftsperson—specifically, in the form of the thing as it exists in the mind of the maker. Both Aristotle and his contemporary descendants are primarily concerned to distinguish artifacts from objects that occur naturally, without any human intervention.