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Vidal’s (1994) book Piaget before Piaget has Index references to realism + nominalism. Reading these - and reading between them - it’s evident that the seeds of constructivism were there circa 1917. And they soon proved to be fertile inPiaget’s?accessible writings from 1918 onwards (e.g. on the website you mention). In this regard (constructivism as an alternative to realism and nominalism: and recall that Wittgenstein later argued for constructivism), if anyone can answer the question in footnote 1 of my 2009 paper, please let me know. Constructivism has substantive implications.?Here’s the question: "In 1928, Wittgenstein was encouraged to attend Brouwer's [1929] seminar on intuitionism in Vienna [Johnson-Laird, 1983; Richardson, 1976]. It led in 1929 to his return to academia and the development of his rule-following paradox [RFP]. An open question is Brouwer's 1934 seminar in Geneva: did Piaget attend [cf. van Atten, 2005]? " Smith, L. (2009). Wittgenstein's rule-following paradox: how to resolve it with lessons for psychology. New Ideas in Psychology, 27, 228-242.