What does informal balance refer to in design?

Informal balance in design is characterized by the placement of different but visually equivalent design elements around a central point. This approach creates a sense of balance and harmony without relying on symmetry, which can often appear rigid or formal. By using various shapes, colors, and sizes that possess a similar visual weight, informal balance allows for a more dynamic and organic composition. This method can enhance the visual interest and evoke a more relaxed, natural feel in a space or artwork.

The other options are focused on more rigid forms of balance—such as symmetrical balance with identical objects or arrangements mirroring each other—which do not capture the essence of informal balance found in the correct answer.