Niels Bohr — "The meaning of 'real' is not a fixed one, but depends on the context."
The meaning of 'real' is not a fixed one, but depends on the context.
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More from Niels Bohr
"The electron is not a 'thing' in the usual sense of the word. It is a system of relationships."
"The problem is not to make things simple, but to make them understandable."
"Never express yourself more clearly than you are able to think."
"The meaning of our words is always context-dependent."
"The aim of atomic physics is to understand the world in which we live, and we are ourselves a part of this world."
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Understanding this quote
What it means
What counts as 'real' shifts depending on the situation you are examining. An object or property is not reliably real in some absolute sense; instead, its reality is defined by the experimental setup, the frame of reference, or the question being asked. Reality is relational, not fixed. The same thing can be described differently and still be accurate, because meaning itself is tied to context rather than existing independently of observation.
Relevance to Niels Bohr
Bohr built his career on exactly this insight. His complementarity principle held that electrons behave as waves or particles depending on how you measure them, and neither description alone is complete. As architect of the Copenhagen interpretation of quantum mechanics, he insisted that observation shapes outcome. This quote captures the philosophical core of his atomic model: subatomic reality cannot be pinned down without specifying the measurement context that produced it.
The era
Bohr worked through the early twentieth century quantum revolution, when classical physics was collapsing under experiments it could not explain. Einstein, Heisenberg, Schrodinger, and Bohr were redefining matter, causality, and observation. His debates with Einstein about whether God plays dice became legendary. Against this backdrop of upheaval, two world wars, and the Manhattan Project, redefining what counts as real was not abstract philosophy but urgent science reshaping how humans understood nature itself.
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