This faculty has “epistemic” and “non-epistemic” forms according to a 1969 book by Fred Dretske. David Lewis published a paper titled for this faculty “censored” under his cat’s name “Bruce Le Catt,” critiquing his earlier paper where he discussed its “prosthetic” form. This faculty titles a Susanna Siegel book which contrasts (15[1])“content” (15[1])and “rich content” views of it. A 2023 Ned Block book about the “border” between this faculty and thinking argues that it is constitutively (*) non-propositional, non-conceptual, and iconic. Frank Jackson’s “many property” objection is an argument against adverbialist theories of this faculty, which is also the subject of J. J. Gibson’s direct realist “ecological approach.” John Locke (10[1])introduced a thought experiment concerning whether a man, (10[1])after having this faculty (10[1])restored, (10[1])could tell a cube (10[1]-5[1])apart from a sphere. For 10 points, (10[1])Molyneux’s problem concerns what faculty? (10[1])■END■