Designers use unity to make elements in a composition appear to belong together. When each elements has a clear visual relationship to one or more other elements, the composition is unified. When unity is achieved:
Some of the ways to achieve unity include:
Repeating colors, shapes, values, textures, or lines creates a visual relationship between elements, called correspondence.
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Treating different elements in the same manner also ties them together. This is called continuity.
When and element is placed in a composition, it creates an implied horizontal and vertical axis at its top, bottom, center and sides. Aligning other elements to these axes creates a visual relationship which unifies them.