‘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’.
Elsewhere Heisenberg notes:
‘What we observe is not Nature in itself but Nature exposed to our method of questioning’. [This is a powerful insight. Try and hold on to it as we move on.]