Which is NOT a principle of visual communication?

Line is indeed an essential element used in visual communication, but it is not classified as a principle. In visual communication, principles refer to broader concepts that guide the organization and composition of visual elements. Balance, repetition, and hierarchy all serve as guiding principles that help in establishing order, unity, and emphasis within a design.

Balance involves the distribution of visual weight in a design, ensuring that it feels stable. Repetition entails the use of similar elements throughout a design to create unity and consistency. Hierarchy helps in guiding the viewer's eye through the content, indicating which elements are the most important and should capture attention first.

Understanding these principles allows designers to effectively communicate messages through visuals, creating impactful designs that resonate with their audience.