Rules of Perceptual Organization

Closures are when we organize stimuli  into groups together and we tend to fill in missing parts of a figure to make the figure appear full.

Continuity is when we organize stimuli into groups in which we see a continuous straight or curving line that follows a smooth path. 

Similarity is when we organize stimuli into groups together by similar shape, dimension, size, color etc. 

Proximity is when we organize stimuli into groups by how close they are together.

Figure-ground perception is when we organize stimuli, we automatically distinguish a figure from its background.