"Our tissues change as we live: the food we eat and the air we breathe become flesh of our flesh and bone of our bone, and the momentary elements of our flesh and bone pass out of our body every day with our excreta. We are but whirlpools in a river of ever-flowing water. We are not stuff that abides, but patterns that perpetuate themselves"
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Source : Norbert Wiener (1988). “The Human Use of Human Beings: Cybernetics and Society”, p.96, Da Capo Press