Which of the following is not a principle of perception? 

The concept of perception is given by Max Wertheimer. In the early 20th century, three German psychologists Max Wertheimer, Wolfgang Köhler and Kurt Koffka proposed new principles for explaining perception called as Gestalt principle.

• According to these psychologists, the process of perception does not involve perceiving an array of stimuli as an object but it involves our tendency to seek a form or pattern in it. 

• ​Perception may be defined as the way a person sees the universe, he feels about certain elements in a situation.
• Perception is the stage in which an internal representation of an object is formed. This representation provides a working description of perceiver’s external environment.
• Perception involves synthesis of simple sensory features into percept of an object that can be recognized

Key Points

Main principles of perceptual are:

• Law of Proximity: In order to perceive stimuli meaningful, stimuli which are closer to each other are perceived by us belonging to one group. Due to this reason, people tend to see following circles as cluster or group rather than individual circles. Our brain tends to group large elements as one to make us interpret more easily.
• Law of Continuity or Good Continuation: It refers to our tendency to perceive figures in continuation rather than in parts. This principle is exhibited more in the perception of the line. 
• Law of Closure: Following its name, this law should not be confused with the law of proximity. This law states that we tend to perceive stimuli as closed shapes even with some missing parts.
• Law of Common Region/Common Fate: This principle states that stimuli moving in similar directions are perceived as belonging to the same group.
• Law of Good Form/Pragnaz: The word Prgnaz is a German in origin, meaning “good figure”. This principle is also called as “law of good figure”. According to this principle, out of all possible ways of grouping stimuli, we tend to group stimuli in the simplest and stable shape.

Hence, the correct answer is Uniformity.