 In the Inaugural Dissertation §15, Kant tries to move beyond the dichotomy of taking space and time to be either substances or phenomena, taking space instead to belong to the “form”of sensible intuition. As he expresses it in the Critique of Pure Reason, “Space and time are [our sensibility’s] pure forms…” (KRV A42/B60). They are “merely subjective conditions of all our intuition.” (ibid., A 49/B 66). [See the entry on  Kant’s views on space and time.]