Human beings are exposed to the "real world," which is very complex. The large area of the human brain offers an almost unlimited capacity to store symbols for objects and events from the real world. It develops its own symbols for objects and events in the outside world. The organisation of these symbols is also necessary for effective retrieval.

What makes it significant to the field of design is the fact that this coding is based on sensory information, and for most objects, it is primarily the visual component of the information about the object that is used in processing. Understanding how the coding process exploits the semantic information available from the objects can help us learn to deal with semantic issues more effectively.

The term "sustainability" refers to the process of reducing the environmental impact of a product. The strategy used to construct categories and form concepts is uniquely different and can offer clues on how visual information can be controlled.

The categorization process demonstrates the superiority of human information processing over intelligent machines. It is advantageous not to differentiate the object from others as long as the behaviour and properties of the objects within the category remain predictable. So instead of categorising objects into a large number of finely discriminate and tight concepts, the mind automatically chooses the cognitively economical option of neglecting the infinite difference among the objects to achieve behaviorally and cognitively usable proportions. The categorization process treats nonidentical objects as equivalent when differences are irrelevant to the human response. Objects within a category appear to substantially share features that show a clear correlation. The fuzziness of the boundaries, an important characteristic of the human categorization process, does not create operational problems because the categories are not defined by their boundaries but by their centres.