ok, I belabored the point for a reason. As LBR said in his posts, as the target gets further away from the base of the tree, the increased distance has more effect on the arrow flight, though not enough to change how hunters, at limited distances, shoot. Here is my point about stand hieght, prolly belaboring it but still maybe important:
in the tower illustration, gravity is in aiding arrow flight more than hindering it. at 10 feet in a stand, a target 20 yards away aroow flight will be more affected by the increased distance of being in a tree than if the shooter was 25 feet up a tree, despite the distance being greater 25 feet up a tree. I believe this to be true, I mapped out an equation(might be wrong though, I'm no physicist, I'm a history major) on my graphing claculator and it works at hunting distances. Eventually it changes but only for an incredibly long shot or short hieght hieght. The reason is that when 25 feet up a tree the aroow is aimed more doward, with the directional force of gravity than it would be at 10 feet, and therefore arrow flight in relation to distance is less affected by gravity.
I then come to the conclusion the for bow hunters, once the decieving vision perception issue is resolved, the higher the stand the better, as it decreases the gravitational effect on horizontal arrow flight. does that make any sense? I think it works, basically, I think you should climb high as you can.