Until Einstein (roughly), THE universe of Newton was, for us, THE universe. With Einstein, it became A universe. Something similar happen to man. A new 'man' was produced, just as good, certainly contraditory to the old one. THE man became A man, otherwise a 'conceptual construction', one among the infinity of possible ones.
Alfred Korzybski, Science and Sanity: An Introduction to Non-Aristotelian Systems and General Semantics
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