Patterns of different sized shapes or components in a painting create a visual repetition providing the artwork with rhythm and motion. Finished and unfinished recognizable parts allow the visual to be understood by the viewer and complete in their mind.
This is a good example of what I am discussing in my workshops as Chaos and Order. I use this to create a sensation in what I am referring to as my Sensationalism movement in painting.

Rhythm n Motion on Beach, Oil on panel, 54 x 24 inches
© 2013 Daryl Urig