This completes my account of Kant’s critical idealism, understood as an ontological position, as developed in the Critique and associated theoretical writings. According to Kant, the world, understood as the sum total of everything that has reality, comprises several levels of reality, most importantly, the transcendental level and the empirical level. The transcendental level is a mind-independent level at which Kantian things in themselves exist; the empirical level is a mind-dependent level at which Kantian appearances exist. Things in themselves are mind-independent, appearances are fully mind-dependent. Things in themselves and appearances are numerically distinct and do not ontologically overlap in any way. Kantian outer appearances essentially are intentional objects of outer experience; Kantian inner appearances essentially are intentional objects of inner experience. Empirical objects are Kantian outer appearances, empirical space and time are constituted by the spatial and temporal determinations of outer appearances, pure space and time are (nothing but) forms of sensibility, and empirical selves, or empirical minds, are Kantian inner appearances. In contrast to other intentional objects, such as the intentional objects of fictions, dreams, hallucinations, illusions, and perceptions, Kantian appearances genuinely exist, that is, they exist from the point of view of fundamental ontology. This is due both to the special character of experience, in particular, the special character of outer experience and its conformity to Kant’s formal conditions of objectivity, and to the grounding of Kantian appearances in things themselves. Kantian things in themselves transcendentally affect sensibility and thereby bring about sensations, which provide the ‘matter’ for Kantian appearances and underwrite their existence. Kantian things in themselves are supersensible, non-spatial, and non-temporal, as well as distinct from God and thus finite. Each inner appearance is grounded in a unique Kantian thing in itself that is a human transcendental mind, and all outer appearances are grounded in Kantian things in themselves that are distinct from all human minds. What we commonly call ‘the external empirical world’ exists, including empirical space and time. Accordingly, there is also at least one Kantian thing in itself that is not a human mind. Moreover, there is at least one human being, that is, an entity whose ontologically basic parts include, minimally, a body (which is an empirical object), an empirical self (which is an empirical mind), and a transcendental self (which is a human transcendental mind). Since other intentional objects that are not Kantian appearances, although not genuine existents, are not nothing but have some reality and being, it is useful to conceive of Kantian reality as including yet another mind-dependent level to provide a home for these other fully mind-dependent entities—even if this conception goes beyond the direct textual evidence and may also go beyond Kant’s private, explicitly articulated thoughts on the matter. The ultimate basis for Kant’s case for transcendental idealism is the finitude of the human mind and, more specifically, its fundamentally uncreative nature in which this finitude manifests ...
Cogito, ergo est cogitabile. Cogitabile est, ergo cogito
