There is no ingroup. Ribbonfarm is a strip mall. Ingroup is Sarah's hobby project.
2min google suggests he got it from Piaget, who was a major influence on him.
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Seems like it should tell us something important about cognition, or at least the development of cognition, but doesn’t seem understood…
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some discussion at https://books.google.com/books?id=-AW4CwAAQBAJ&pg=PT59&lpg=PT59 … if anyone is interested
End of conversation
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