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.
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About Alfred Korzybski
Alfred Korzybski was a 19th-century American american scholar and philosopher. Alfred Habdank Skarbek Korzybski was a Polish-American philosopher and independent scholar who developed a field called general semantics, which he viewed as both distinct from, and more encompassing than, the field of semantics. He argued that human knowledge of the world is limited both by the human nervous system and the languages humans have developed, and thus no one can have direct access to reality, given that the most we can know is that which is filtered through the brain's responses to reality. Read more on Wikipedia →