ABSTRACT
Piaget is primarily interested in the nature of knowledge, and for him knowledge is concerned either with states or with transformations of states. In the language of logic one could say that knowledge either describes a thing or that it operates on a thing. A glass, for instance, can be observed as a state, something which has a certain shape; or it can be looked upon as something that can be operated on, either externally or internally, something that one knows how to use, construct or repair. All knowledge, according to Piaget, implies not merely a reading of but also a transformation of reality. Consequently static aspects of knowledge can be distinguished from dynamic transformations.
