Objects that are near, or proximate to each other, tend to be grouped together.
The principles of grouping (or Gestalt laws of grouping) are a set of principles in psychology, first proposed by Gestalt psychologists to account for the observation that humans naturally perceive objects as organized patterns and objects, a principle known as Prägnanz. Gestalt psychologists argued that these principles exist because the mind has an innate disposition to perceive patterns in the stimulus based on certain rules. These principles are organized into five categories: Proximity, Similarity, Continuity, Closure, and Connectedness.
Law of Uniform Connectedness
Elements that are visually connected are perceived as more related than elements with no connection.
The Pareto principle states that, for many events, roughly 80% of the effects come from 20% of the causes.