Contrast
Similar design elements should be avoided. Elements should either be the SAME or VERY DIFFERENT.
Image Source: makesigns.com
Repetition
Repeat elements throughout the design in order to create a more unified piece.
EXAMPLE:
Alignment
Text and images in the design must have a visual connection to other text and images. No element should be placed arbitrarily in the design.
Image Source: Lesa Snider, Macworld
