Which design principle involves creating visual movement and direction in an image?

The correct answer is rhythm, as it specifically pertains to creating a visual flow or movement within a design. Rhythm in design refers to the way elements are arranged to direct the viewer's eye through the composition. This can be achieved through repetition of shapes, colors, or patterns, helping to establish a sense of movement and pacing that guides the viewer's experience of the image.

Rhythm effectively communicates a feeling of continuity and enables the design to lead viewers along a path, highlighting important aspects of the composition. It creates an engaging experience, allowing the viewer to interact with the visual narrative in a dynamic way.

The other options involve different principles of design. Harmony focuses on the pleasing arrangement and integration of various elements, promoting unity rather than movement. Proportion pertains to the relative size and scale of elements in relation to one another, influencing the visual weight and balance but not specifically directing movement. Balance refers to the distribution of visual weight in a design, ensuring stability and equilibrium without necessarily guiding movement. Thus, rhythm stands out as the principle most closely aligned with creating movement and direction in an image.