Just so with the human eye. It will
give both effects, but never a clear background and moving object
at the same time, once that object reaches a point 10 feet from
the eye. The perspective is wrong, and the eye cannot adjust
itself to the distance range speedily enough.
Now the tennis ball is your moving object while the court,
gallery, net, and your opponent constitute your background. You
desire to hit the ball cleanly, therefore do not look at the
other factors concerned, but concentrate solely on focusing the
eye firmly on the ball, and watching it until the moment of
impact with your racquet face.
"How do I know where my opponent is, or how much court I have to
hit in?" ask countless beginners.
Remember this: that a tennis court is always the same size, with
the net the same height and in the same relation to you at all
times, so there is no need to look at it every moment or so to
see if it has moved. Only an earthquake can change its position.
As to your opponent, it makes little difference about his
position, because it is determined by the shot you are striving
to return. Where he will be I will strive to explain in my
chapter on court position; but his whereabouts are known without
looking at him. You are not trying to hit him. You strive to miss
him. Therefore, since you must watch what you strive to hit and
not follow what you only wish to miss, keep your eye on the ball,
and let your opponent take care of himself.
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