Abstract

Open peer commentary on the article “A Temporal Puzzle: Metamorphosis of the Body in Piaget’s Early Writings” by Marc J. Ratcliff.: Ratcliff’s target article is an insightful introduction to a major corpus, the journal comprising the notes of Jean and Valentine Piaget in their studies of their three children. These studies were part of a research program in what Jean Piaget called “genetic epistemology.” My commentary focuses on a series of epistemological issues central to this theory of knowledge.