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In contrast to a zoom, when camera operators
dolly forward or backward, the position from which the object
is viewed shifts. And because the point of view changes in
the dolly shot, we see the object from a different angle.
Parts of it are revealed that were previously concealed, and
vice versa (see Fig. 6.7, taken from the ending of a dolly-in
shot that begins at the same position as the zoom in of Fig.
6.5). In Fig. 6.7 we see the entire picture on the wall behind
the pianist, where at the start of the dolly (Fig. 6.5) it
is partially blocked. Contrast this with the zoom in on the
same subject matter (Fig. 6.6).
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