Rhythm in interior design comes from repetition. You can repeat a shape or a color to let your eye move throughout the room.
The Southhaven sectional from Rowe is in a diamond-quilted, red cotton slipcover. The color is repeated in the artwork on the wall and the pattern of the chairs' upholstery (also from Rowe.) In turn, the chair fabric is used on pillows that are placed on the sectional.