Final answer:
In design, unity can be achieved by similarity, where elements with similar characteristics create a sense of cohesion. Adding elements that are different or unique can create variety and add visual interest.
Step-by-step explanation:
In design, unity can be achieved by similarity. This means that elements in a design that share similar characteristics, such as color, shape, or texture, create a sense of unity. For example, using a consistent color palette throughout a design can help achieve unity. On the other hand, adding elements that are different or unique can create variety and add visual interest to the design.