(Gestalt psychology identifies the principles by which our visual system processes sensory information it receives. They are laws that describe how the elements of the perceptual field are grouped or split to give rise to perceptual units in which we structure reality. This illustration is made with of the law of Pragnanz: the form that is established is as "good" as the given conditions allow. What basically determines the appearance of the forms is the characteristic of "significance" or "good shape" they possessed: the more regular, symmetrical, cohesive, homogeneous, balanced, simple, concise they are, the greater the probability who impose itself to our perception.)