Rhythm is a fundamental principle of design that involves repetition. There are several types of rhythmic patterns including regular rhythm, alternating rhythm, and progressive rhythm. Regular rhythm uses consistent repetition of elements like the vertical lines in Gene Davis' painting Billy Bud that create a steady, drum-like beat. Alternating rhythm involves the repetition of two motifs that take turns, like the columns and spaces in a Greek temple. Progressive rhythm features a repeated element that changes in a regular way, such as the concentric shapes in Hundertwasser's painting Der gross Weg that gradually increase in size across the work. Rhythm creates movement and visual interest through repetition.