In contrast to the structuralist approach , the emphasis in the Gestalt approach was on the configuration of the elements, rather than on the elements per se. Proximity Objects that are closer to one another tend to be grouped together. Similarity Objects that are more similar to one another tend to be grouped together. Closure Objects that form closed units tend to be grouped together. In the other case, the T stands out on its own, which makes it easier to see.
Good continuation says that elements forming continuous lines or curves are grouped together.