Gestalt Principles:
Grouping: The eye naturally groups similar objects by color, value, shape, location and orientation
Containment: Format creates unity and determines positive and negative space
Repetition: Same visual effect used over and over.
Proximity: Distance between visual elements.
Continuity: Fluid connection among compositional elements that can be actual or implied.
Closure: Inclination to connect fragmentary information to produce a completed form.