“The observing mind is not a physical system, it cannot interact with any physical system.”

—  Erwin Schrödinger

Nature and the Greeks (1954)
Context: The observing mind is not a physical system, it cannot interact with any physical system. And it might be better to reserve the term "subject" for the observing mind. … For the subject, if anything, is the thing that senses and thinks. Sensations and thoughts do not belong to the "world of energy."

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Erwin Schrödinger 67
Austrian physicist 1887–1961

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