It is also called "Law of Relationship":

Question

Accepted Answer

The correct option is 3: Harmony.
Harmony is often called the "Law of Relationship" in art because it is the overarching principle that governs how all the various elements of an artwork—such as line, shape, color, and texture—are brought together into a visually pleasing, cohesive whole. It deals with the careful selection and arrangement of these elements to ensure they share a common quality, preventing the artwork from appearing cluttered or disjointed. When an artwork exhibits harmony, every component relates and belongs to the others, creating a feeling of unity and completeness, which is the ultimate visual relationship in a composition.

The incorrect option is 1:
Proportion is a distinct principle of art that deals specifically with the relative size and scale of parts within a whole object or composition. For example, it defines the size relationship of a figure's head to its body, or a foreground object to a background object. It is essentially the law of *size relationship*, not the general law governing the unity of all visual elements in a cohesive manner. While good proportion is necessary for realistic or consistent art, it is only one component contributing to the overall harmony of the entire piece. Proportion focuses narrowly on internal size ratios, whereas the "Law of Relationship" implies a broader focus on overall visual coherence.

The incorrect option is 2:
Rhythm is defined as a principle of art that uses the regular or irregular repetition of elements to create a sense of movement, pattern, and visual flow across the artwork. It is the visual equivalent of a musical beat or tempo, guiding the viewer's eye from one area to another. This repetition or flow establishes a distinct type of relationship based on sequence, but it does not encompass the whole-to-whole relationship of all elements. Therefore, this principle is primarily one of *movement* and *sequence*, not the comprehensive and all-encompassing coherence implied by the "Law of Relationship."

The incorrect option is 4:
Dominance, also known as Emphasis, is the principle used to create a focal point—a specific area that draws the viewer's attention and is clearly more important than the rest of the composition. This is achieved through contrast, size, or placement, which intentionally creates a relationship of *hierarchy* and *focus* among the elements. Its purpose is to deliberately make one element stand out by subduing others. While a necessary principle for guiding the viewer's eye, it works by highlighting *differences* and *importance*, which is contrary to the idea of a universal "Law of Relationship" that promotes the overall *unity* and *coherence* of the entire work.