The paper investigates the distinction between form and matter in Kant’s theoretical philosophy – his adoption of an Aristotelian hylomorphism. This connection to Aristotle is sometimes recognized in Kant scholarship, though most proponents claim that against the backdrop of a structural analogy, Kant and Aristotle also differ in an important respect: according to them, while Aristotle puts forth a hylomorphic conception of being, Kant merely offers a hylomorphic conception of cognition in which sensibility provides the matter and understanding the form. (...) Against this, the paper claims that this “interiorization” of form cannot be squared with Kant’s actual views. Form is not internal for Kant, but neither is it external. Rather, it is “original form”. This interpretation ascribes a “hylomorphism all the way down” to Kant, meaning that the form and the matter of cognition are jointly actualized in virtue of each other. The understanding cannot be understood apart from its part in a hylomorphic unity with sensibility. Therefore, a proper appreciation of this unity enables us to see that it is impossible to distinguish the form that objects have as objects of cognition from the form they have in themselves. (shrink)