“The "second order cyberneticians" claimed that knowledge is a biological phenomenon (Maturana, 1970), that each individual constructs his or her own "reality" (Foerster, 1973) and that knowledge "fits" but does not "match" the world of experience”

—  Stuart A. Umpleby

von Glasersfeld, 1987
Stuart A. Umpleby (1994) The Cybernetics of Conceptual Systems http://www.itk.ntnu.no/ansatte/Gulbrandsoey_Kenneth/documents/papers/THE%20CYBERNETICS%20OF%20CONCEPTUAL%20SYSTEMS.pdf. p. 3

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American scientist 1944

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