RHYTHM

􀀷hen there are several similar elements in
a scene, their arrangement may, under
special conditions, set up a rhythmic visual
structure. Repetition is a necessary ingredient, but
this alone does not guarantee a sense of rhythm.
There is an obvious musical analogy, and it makes
considerable sense. Like the beat in a piece of
music, the optical beat in a picture can vary from
being completely regular to variations similar to,
for instance, syncopation.
Rhythm in a picture needs time and the
movement of the eye to be appreciated. The
dimensions of the frame, therefore, set some limits,
so that what can be seen is not much more than
a rhythmical phrase. However, the eye and mind
are naturally adept at extending what they see (the
Gestalt Law of Good Continuation), and—in a
photograph such as that of the row of soldiers on
page 183— readily assume the continuation of the
rhythm. In this way, a repeating flow of images is
perceived as being longer than can actually be seen.
Rhythm is a feature of the way the eye scans the
picture as much as of the repetition. It is strongest
when each cycle in the beat encourages the eye
to move (just as in the example to the right). The
natural tendency of the eye to move from side to
side (see pages 12-15) is particularly evident here, as
rhythm needs direction and flow in order to come
alive. The rhythmical movement is therefore usually
up and down, as vertical rhythm is much less easily
perceived. Rhythm produces considerable strength
in an image, as it does in music. It has momentum,
and because of this, a sense of continuation. Once
the eye has recognized the repetition, the viewer
assumes that the repetition will continue beyond
the frame.
Rhythm is also a feature of repetitive
action, and this has real practical significance in
photographing work and similar activity. In the
main picture opposite, of Indian farmers in the
countryside near Madras winnowing rice, the
potential soon became apparent. The first picture
in the sequence is uninteresting but shows the
situation. The individual action was to scoop rice
into the basket and hold it high, tipping it gently
so that the breeze would separate the rice from
the chaff. Each person worked independently,
but inevitably two or more would be in the same
position at the same time. It was then a matter of
waiting for the moment in which three were in
unison, and finding a viewpoint that would align
them so that the rhythm has maximum graphic
effect. These things are never certain—someone
could simply stop work—but the possibility in a
situation like this is high.