Some phrases become a part of our lives without ever being defined or understood.
Many people suppose that there is some sort of vague association between this phrase and Gestalt psychology. While it is good to have a clear statement of the phrase, such clarification alone does not really provide a solid basis for understanding the meaning of the saying. To know this one needs to know a little about Gestalt psychology. Gestalt psychology attempted to identify and explain certain aspects of perception. Careful investigation of such issues helped define the limits and capabilites of our perceptual systems.