Final answer:
The category of unity that has been applied to the design when a viewer's eye follows a line or edge from one element to another and groups the elements due to their connection is visual unity.
Step-by-step explanation:
The category of unity that has been applied to the design when a viewer's eye follows a line or edge from one element to another and groups the elements due to their connection is visual unity.
Visual unity refers to the sense of completeness and cohesiveness in a work of art. When elements are visually connected through lines or edges, it creates a unified composition where all the parts fit together.
For example, in a painting, if the lines and edges guide the viewer's eye from one object to another, forming a visual connection between them, it creates a sense of unity in the overall composition.