Everything we call real is made of things that cannot be regarded as real.
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Often attributed to Bohr online, and in some books like Our Mathematical Universe by Max Tegmark (p. 157) and The Great Unknown: Seven Journeys to the Frontiers of Science by Marcus du Sautoy (p. 99), the quote is actually from John Gribbin's book In Search of Schrodinger's Cat: Quantum Physics And Reality (1984), p. 211.