Note 581 — THE TRANSCENDENTAL AESTHETIC SECTION II TIME METAPHYSICAL EXPOSITION OF THE CONCEPTION OF TIME
Reading edition
A 46 = B 64. Cf. Dissertation, § 15 C. In the concluding sentence of the first edition’s Aesthetic, Kant for the first time uses the singular Ding an sich in place of the more usual Dinge an sich and also refers to it in problematic terms as what may underlie appearances.