Dear all, I recently came across an intriguing volume entitled "Morphisms and Categories: Comparing and Transforming". The lead author is Piaget, one of the foremost names in developmental psychology, who died in 1980. The volume is a collection of papers, many of which seem to enthusiastically apply ideas of category theory to developmental psychology. I haven't seen the book itself, but this link lets you read the full introduction and the first page of each chapter: http://www.questia.com/library/6364330/morphisms-and-categories-comparing-an... Reading the introduction, it's clear that Piaget took very seriously the idea that category theory could provide a formal foundation for psychology. Does this perspective survive in the modern psychology literature? Does anybody know how Piaget came to be acquainted with these categorical ideas in the first place? Is there anything here that could be of interest to modern category theorists? Best wishes, Jamie. [For admin and other information see: http://www.mta.ca/~cat-dist/ ]