 These modifications have two radical consequences for Kantian doctrine, consequences that characterize the Marburgers’ own theory of science and cognition. The first is a new conception of science; the second is a new conception of the categories (see  Section 4).  It might seem that science, as the achievement of an autonomous rationality, must fail to be objectively true of the world, if reason’s autonomy implies that it can have no intuitive, receptive link to the world via sensibility. How in general could the rationally constructed system be related to experience or constrained by it? How in particular could physics, the science of motion in space and time, be possible if the pure forms of intuition, space and time, were banished from science (cf. Friedman 2000: 26, ff.)?