 For Deleuze and Guattari in What is Philosophy?, then, science deals with properties of constituted things, while philosophy deals with the constitution of events. Roughly speaking, philosophy explores the plane of immanence composed of constellations of constitutive forces that can be abstracted from bodies and states of affairs. It thus maps the range of connections a thing is capable of, its “becomings” or “affects.” Science, on the other hand, explores the concretization of these forces into bodies and states of affairs, tracking the behavior of things in relation to already constituted things in a certain delimited region of space and time (the “plane of reference”). How do concepts relate to functions? Just as there is a “concept of concept” there are also “concepts of functions,” but these are purely philosophical creations “without the least scientific value” (WP 117). Thus concrete concepts like that of “deterritorialization” are philosophical concepts, not scientific functions, even though they might resonate with, or echo, scientific functions. Nor are they metaphors, as Deleuze and Guattari repeatedly insist: