This paper is founded on a close reading of Kant’s Opus Postumum in order both to explore the essential motivation that drove Kant to write a last comprehensive magnum opus (after having completed his critical philosophy) and, by doing so, to show the essential link between his aesthetics and the idea of Übergang, the title of this last work. For this work contains not only his dynamical theory of matter defining motion as preliminary to the notions of space and time, and the advanced version of his philosophy of natural science, but also his arguments for the phenomenal validity of the metaphysical foundations (or the essential unity of the theoretical and practical reason), his teachings on the aesthetic human faculties of judgment and An...