wild attempt: try to put your hand behind your back: are you aware of "where" your hand is, even though you cant see it?
now if someone taps on one of those fingers on that hand behind your back, could you put that same finger down (curl it) without seeing which finger was tapped?
lastly, could you open your hand, put it back in front of you, and put down the same finger that was tapped when they were behind your back?
it's the same way with my mental images; i'm aware the object exists and ive seen it before, so i can "see" them again in the same headspace to do things like analyze angles between molecular bonds, in the same way i can "feel" things that i'm recalling (i was tapped on this finger, i am putting this finger down (i dont think "right index finger" or anything...consciously? i just remember how the touch impulse felt and 'replay' it))