 The second discipline of rationalist metaphysics rejected by Kant is Rational Cosmology. Rational cosmology is concerned with the arguments about the nature and constitution of the “world,” understood as the sum-total of all appearances (objects and events in space and time) (A420/B448). The arguments about the world occupy an especially important place in Kant’s rejection of metaphysics. Not only does Kant address himself to the task of discounting the metaphysical arguments in cosmology, but the resolution to some of these conflicts provides, he claims, an indirect argument for his own transcendental idealism.