The use of computer graphics is often limited only to a simple visualization. This happens when the searcher entrusts his data to a specialist, who can use them to make nice pictures. On the other hand the value of works made with the help of a computer is often diminished due to the belief that it is only the result of the use of a new and yet not well known tool. A question arises, however not new at all, what is the contribution of this tool and its user to the new scientific discovery'. The question which cannot be answered univocally should be left here without the answer.