UNITY refers to how different elements of an artwork or design work come together and create a sense of wholeness. It can be achieved through proximity, simplicity, repetition and continuation. - bbc.co.uk
Composition: The organization of elements in a design.
Negative Space: The space and shape created between two objects.
Gestalt: Gestalt principles or laws are rules that describe how the human eye perceives visual elements.
Harmony: When elements in an image look as though they belong together.
Unity: Unity = Harmony and can be achieved through proximity, repetition, continuation, color or by using any of the Gestalt principles. The whole must be predominant over the parts.
Variety: The image is organized, but each design is unique. Creating several designs that must relate to each other using variety in form, size, color, or other visual elements.
White Space: Negative space and white space are related. White space is the area left intentionally blank in a composition.
Techniques For Unity
Proximity: Unity through proximity unites separate elements and makes them look as if they belong together by placing them close together.
Repetition: Unity through repetition is when the artist repeats design elements to create harmony.
Continuation: Literally means “something continues.” The design carries the eye of the viewer through and around the picture.
Grid Layout: A series of vertical and horizontal lines on a page.