No, what I had meant was that If you are talking about the volume of the ball, and not just its surface area, then the air inside it isn't going to be blue, but clear. Even if you call it "black" as in it would appear black were your eyes within it, it still would not be blue.
Volume-wise, the ball isn't going to be blue for more than a fraction of its colors. Since the hollowness is what causes this irregularity, it's safe to assume that it is more spherical than blue.
Exactly. Because of the nature of our eyes, and light in general, we see whatever the ball doesn't keep for itself and don't see what is actually being taken by the ball. We are effectively proving that "One man's trash is another man's treasure". By the act of perceiving a certain color, it means that that is exactly what the ball is not
Much as the dictionary might say otherwise, the ball is the opposite of whatever color is perceived at any given moment. The ball is perceived to be blue, but is the opposite. If we somehow had some kind of instrument to identify what color the ball is, and not what it's given off (which we do, it's called reversing the color scheme and it makes for a very strange world indeed) then we would see it is more any other color than blue, even if it has some blue here and there (reflecting red and green)
Furthermore, other factors have to be taken in, because a ball isn't simply "blue" and "hollow". Otherwise, we would have to consider the weighted average of all the major possibilities, and that would degrade the "blueness" and "spherical-(ness?)" quite a bit.