Rhythm works almost in the same way in interiors as music. Basically you stage a 'visual movement', taking a color, texture, pattern or form and repeating it across a space - just like how songs are formed by the regulated succession of stronger and weaker notes. Of all these unifying elements, color is most commonly used to create rhythm.
In the example as shown, a red tone is repeated in the canvas art, the lamp on the ceiling, the lamp by the side of the sofa and the lounger. A sense of movement is instantly created when this unifying element is repeated throughout the space, guiding our eyes to alight here and there on pieces of the unifier, and hence experiencing every part of the design in the process.