Elsewhere, on the method of proper observation, Heisenberg writes:
‘What we observe is not Nature in itself but Nature exposed to our method of questioning’. Hold on to that insight as you read the posts.
‘Although the Theory of Relativity makes the greatest demands on the ability of abstract thought, still it permits the traditional requirement of Science, as it permits a division of the world into Subject and Object and hence a clear formulation of the Laws of Causality.
This is the very point at which the difficulties of the Quantum Theory begin’.