Which of the following is NOT one of the six Gestalt Principles?

The principle that is not one of the six Gestalt Principles is contrast. The six core Gestalt Principles focus on how we perceive visual stimuli as organized patterns or wholes rather than as separate components. These principles include similarity, where objects that are similar are perceived as a group; common region, which refers to elements within the same bounded area being grouped together; and closure, where incomplete shapes are perceived as complete by our brains.

While contrast is an important concept in visual perception and can certainly affect our perception of stimuli, it is not classified as one of the core Gestalt Principles. Contrast generally refers to the difference between light and dark or colors within a visual field, influencing how we perceive objects but not fitting into the framework of Gestalt principles that describe the innate processes by which we organize visual information.