Artists use repetition and pattern in their artworks to create rhythm by establishing a sense of movement and flow. By repeating certain shapes, colors, or motifs throughout their work, they can guide the viewer's eye in a deliberate manner, creating a visual rhythm that can evoke a sense of harmony, energy, or tension. This repetition can also help to create a sense of unity and coherence within the artwork, tying different elements together and creating a cohesive whole.