The argument goes something like this, that since the 17th century, mechanism and matter have dominated. From 1900 to 1925, physics went through a revolution where we began to realize, well, to a certain approximation, we can neglect the observer. But we can’t neglect the observer if we look carefully, if we do our science carefully. We are always implicated. We are always implicated in quantum mechanics and relativity. There is a subjective dimension—subjective not in the sense of arbitrary or capricious—but there is an observer or an imagined observer everywhere. And the universe requires
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