Some say that the rhythm of a composition is controlled by the spacing of individual elements within the work. To me, this is a ridiculous use of a term denoting temporal reference. No "static" quality should be accorded the name of "rhythm". Hence, I am herewith absconding with this term and putting it to its proper use in works where some sort of action is depicted. (NOT FOR A VASE OF FLOWERS!)They are present in all great, highly structured works of art (primarily in compositions depicting action).
The intent is to lead the subconscious attention of the viewer through a sequence of stops. These bring the work into its fullest state of integration. They may be curved lines or highlighted areas or objects of a certain type.
Here are a few examples:
Note that the curve is always convex to the right side because convex to the left is less indicative of resistance. Movie action goes left to right to show resistance - "Charge of the Light Brigade/Errol Flynn" remember?