When an artist goal is to create a sense of wholeness or completeness in work of art what principal of design is he using?

When an artist aims to create a sense of wholeness or completeness in their work, they are primarily using the principle of unity. Unity refers to the cohesion of elements within the artwork, ensuring that various components work together harmoniously to convey a singular message or feeling. This can be achieved through consistent use of colors, shapes, textures, and patterns, which help to unify the composition and create a balanced, cohesive piece.