This mode, or mould, must also be invented, inasmuch as we make it into something plastic that is shaped by the work of writing, at the same time as it determines both the shape and the substance of what we are saying. Deleuze calls on Georges Buffon (biologist and author of a famous treatise on style), who formulated an analogy between the appearance of the text and the morphology of an animal, to create the expression “inner mould.” Form bears witness to what a body or text is capable of.