Thus the domain of objects is reduced to domain of internal objects of signs. This rich representation structure does not allow one to explain the relationship between external and internal object of the sign. Thus understood sign can virtually represent nothing more but signs. One can assume that it is an intentional reference but then the sign system would be utterly useless as a tool of cognition of the external world. Although explanation of representative properties of sign is not possible solely on the basis of the description of structure as proposed by Pierce, this concept encourages one to trace the possibility of pointing the element that is primary in relation to the sign and the one that creates the sign relation.
Information can be such element.
Although there is not one commonly accepted definition of information, some of its properties have already been identified. Information is encountered in communication processes, in cognitive processes, in biology as well as in physical structures at all levels of organisation of being. Information is commonly met in all nature and is associated with order, variety, structure, influence, although it cannot be identified with any of them. Considering information processes in biology and physics one can say that development of any structure is linked with investing some amount of information. Hence there is a relationship between structure and information.