ABSTRACT
The notion of if not the very term of a natural logic directs and structures Piaget’s whole epistemological enterprise as a philosopher and a logician. Two of his formulae emphasise in a somewhat extreme way the wide span of his postulates, which have both an evolutionist dimension and a structuralist one:
An organism is a mechanism which is involved in transformations.
The logician’s thinking is the most elaborate form of human thinking. (Beth & Piaget, 1966: 311)
Let us read these quotations both as an epigraph and as a frame to the following remarks, for they have been a guideline for a new reading of Piaget’s writings on logic (see References). As such, they are paradoxical in many respects, since the philosopher here associates without any other modality life and the system, the ideas of creation and permanency, as well as the origin and the end of a Becoming that is viewed from the standpoint of the generation of structures.