"The problem of measurement and the observer is the problem of where the measurement begins and ends, and where the observer begins and ends. Consider my spectacles, for example: if I take them off now, how far away must I put them before they are part of the object rather than part of the observer? There are problems like this all the way from the retina through the optic nerve to the brain and so on. I think, that—when you analyze this language that the physicists have fallen into, that physics is about the results of observations—you find that on analysis it evaporates, and nothing very clear is being said."
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Original Language: English
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John S. Bell, in P.C.W. Davies, J.R. Brown (eds.), The Ghost in the Atom: A Discussion of the Mysteries of Quantum Physics (1993)
https://en.wikiquote.org/wiki/Measurement_problem
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Measurement problem
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