Rhythm in photography refers to the regular repeating occurrence of elements in the scene, similar to how musical rhythm involves the regular occurrence of certain musical notes over time. In photography, the repetition of similar shapes sets up a rhythm that makes seeing easier and more enjoyable. Rhythm is soothing and our eyes beg to follow rhythmic patterns. To be effective, rhythm also requires some variability - rhythm that is too similar or perfect may be boring. Therefore when composing your images look for repetition with variation. For instance if you are photographing a fence - one that is perfect will not hold a viewer's interest for long, but one in which some of the posts are bent, broken, larger or smaller will generate more viewer interest.
Demonstrate your understanding of this concept with 2 photographs one portrait and one landscape