“Knowing reality means constructing systems of transformations that correspond, more or less adequately, to reality.”

—  Jean Piaget

Genetic Epistemology (1968) http://www.marxists.org/reference/subject/philosophy/works/fr/piaget.htm – First lecture
Context: Knowing reality means constructing systems of transformations that correspond, more or less adequately, to reality. They are more or less isomorphic to transformations of reality. The transformational structures of which knowledge consists are not copies of the transformations in reality; they are simply possible isomorphic models among which experience can enable us to choose. Knowledge, then, is a system of transformations that become progressively adequate.

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Jean Piaget 66
Swiss psychologist, biologist, logician, philosopher & acad… 1896–1980

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