II. Similarity - a Gestalt principle of grouping based upon the tendency to group like elements.

B. Rhythm can result from repetition. It is the visual equivalent of notes and pauses in music created by repetition, variety and interval. A composition may have a rhythm that:

 
Moves Up and Down Moves In and Out
Is Smooth Is Angular
A rhythm may remind one of:
The Regular Beat of Rock Music The Back and Forth Sway of a Waltz
The Broken Phrasing of Jazz The Swirling of a Stormy Classical Piece
Sometimes a rhythm can be
communicated through a sequence.