It seems to work like this: when something takes your attention, really grabs you, you take it in. Karl Rahner in Spirit in the World, studying Thomistic epistemology, divides his work into two parts, sense and understanding. He says that sense is reciprocal, and this claim finally makes sense to me, twenty years later, after two readings, from the discussion of the PIE root *DEK here. This can only apply to direct sense impressions. If someone else causes you to take something, they've manipulated you: overridden your freedom. If they show you something and it takes you, and you take it, then the thing itself did the taking/being-taken, not the person who showed it to you.