Which term describes the balance in size and arrangement of elements on opposite sides of a plane or line?

The term that describes the balance in size and arrangement of elements on opposite sides of a plane or line is symmetry. In design and visual arts, symmetry refers to the aesthetic principle where elements are arranged in a way that provides a sense of balance and harmony, creating a mirror image effect or proportional relationship on either side of a central axis. This can be achieved through either mirror symmetry, where elements reflect each other, or radial symmetry, where elements are arranged around a central point.

Symmetry is often used to create a sense of order and stability in visual composition, making it pleasing to the eye. In contrast, asymmetry involves a lack of balance but can still achieve harmony through other design principles. Harmony refers more broadly to how well elements work together within a composition, while contrast focuses on the differences between elements to highlight certain features. Symmetry specifically emphasizes the balance achieved through equal or proportionate arrangement on opposite sides, making it a fundamental concept in both Adobe Animate and broader design practices.