For 10 points, name this Scottish author of Treatise of Human Nature and An Enquiry Concerning Human Understanding.
This philosopher discussed billiard balls to unravel the assumption that "constant conjunction" of events implies "necessary connexion" between them. This man wrote that "custom or habit" is the only reason to believe in causation, an example of his skepticism about induction. This empiricist wrote that all ideas come from impressions, except when considering colors one has seen and imagining a "missing shade of blue" between them. For 10 points, name this Scottish author of Treatise of Human Nature and An Enquiry Concerning Human Understanding.
This philosopher discussed billiard balls to unravel the assumption that "constant conjunction" of events implies "necessary connexion" between them.
David Hume