Rhythm depends largely upon the elements of pattern and movement to achieve its effects. The parallels between rhythm in sound/ music are very exact to the idea of rhythm in a visual composition. The difference is that the timed "beat" is sensed by the eyes rather than the ears.
Visual rhythm can be created in a number of ways. There is Linear rhythm which refers to the characteristic flow of the individual line. Accomplished artists have a recognizable manner of putting down the lines of their drawings that is a direct result of the way they make those lines, which if you look at them, can be seen to have a rhythm of their own. Linear rhythm is not as dependent on pattern, but is more dependent on timed movement of the viewer's eye.
Patrick Raymond, Rhythm Series
Repetition involves the use of patterning to achieve timed movement and a visual "beat". This repetition may be a clear repetition of elements in a composition, or it may be a more subtle kind of repetition that can be observed in the underlying structure of the image.
Andy Warhol, 1960's
Emphasis, also known as the focal point of an image marks the locations in a composition which most strongly draw the viewers attention. Usually there is a primary, or main, point of emphasis, with sometimes a secondary emphases in other parts of the composition. The emphasis is usually an interruption in the pattern or movement of what the viewer sees in the piece and breaks the rhythm.
The artist or designer uses emphasis to make something stand out, or to vary the composition in order to hold the viewers interest.
Darren Rowse
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