I've always liked to picture all of my possible contact points as a 3-dimensional figure resembling a long, curved tube. It's as if my frame is a brush that paints in space the window in which I have to capture the ball when I time correctly.
If imagined in this way (along with dominikk's figure above), it becomes clear that our contact point for lower balls is farther back, and for medium-height balls it is more out in front.
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