The definition is actually a point everybody can see (not "visualize", but see with their actual eyes).
And there's still the subjective task of hitting it with the corresponding point on the CB, which nobody can see (but which can be estimated to a workable degree of accuracy after much practice).
These are some of the obvious reasons aiming can never be fully "objective".
pj
chgo
I appreciate your agreement, but to clarify:Yes, a point that is real/objective not imagined or conjured/subjective. Such a point exists on both the cb and the ob, although the cb is a pure white color and it is hard to find the cb contact point. Yes.
Whether or not a point on a ball can be geometrically defined has nothing to do with whether or not it can be objectively seen - if it isn't visibly marked somehow its location must be estimated.
The CB contact point is on the other side of the ball, so it can't be seen at all.
pj
chgo