 We prefer the first alternative. From this point of view, the decisive event to which Kant is referring is his reading of Hume’s Enquiry (in translation) during the late 1750s to mid 1760s, and this event, we believe, is clearly reflected in two important writings of the mid 1760s: the Attempt to Introduce the Concept of Negative Magnitudes into Philosophy (1763) and Dreams of a Spirit-Seer Explained by Dreams of Metaphysics (1766).