  Kant's interest in physics continued after the publication of the Metaphysical Foundations, in fact, until the very end of his productive years. Though Kant never completed a manuscript that could be put forward as a publication, the various notes, sketches, and drafts on topics in physics that he was working on intensively during this time (especially after 1796) were gathered together over a century after his death and published as his so-called Opus postumum.