You may not see it but your body (or your mind, take your pick) does. You may concentrate so hard that you only see the target but you are somehow aware where it is. I was trying to adjust an Ithaca pump gun that was shooting high and Kutter, a member of this board suggested a larger front bead. It moved the point of aim down and I can assure you I don't see the bead. I now really enjoy that gun. There is a discussion of this in the do it yourself section.

So many guns, so little time!