- Adding a border around an element or group of elements is an easy way to create common region.
- Common region can be created by defining a background behind an element or group of elements.
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.
Objects that are near, or proximate to each other, tend to be grouped together.
Elements that are visually connected are perceived as more related than elements with no connection.
The time to acquire a target is a function of the distance to and size of the target.