Abstract: This paper discusses the essence of visual perceptual organization.Numerous facts of wholistic perception indicate that a primitive andgeneral function of the visual system may be the perception of globaltopological properties. With the aid of the mathematics of ToleranceSpaces, global properties can be described on a discrete set. Thus, thelawful regularities that underlie the perceptual organization, for example,the Gestalt laws of proximity and similarity, may be described math-ematically by the global topological(or tolerance)properties The essenceof Gestalt is just the abstraction of global tolerance properties.

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