Is the Knowledge Argument a Frege Puzzle?

Frank Jackson’s Knowledge Argument claims that Mary—a neuroscientist who knows all the physical facts about color perception but has never seen color—learns something new when she sees red, posing a challenge to physicalism. While physicalists deny that Mary acquires knowledge of new facts, they must still explain her apparent epistemic progress. I argue that the intuition that Mary gains new knowledge upon seeing red stems from the alleged opacity of propositional attitude ascriptions—the same phenomenon underlying Frege puzzles.