Interesting paper by Aage Bohr, Nobel prize laureate and son of Niels Bohr:

The Principle Underlying Quantum Mechanics

http://cdsweb.cern.ch/record/832204/files/cer-002518578.pdf

The present article reports on the finding of the principle behind
quantum mechanics. The principle, referred to as genuine
fortuitousness, implies that the basic event, a click in a counter,
comes without any cause and thus as a discontinuity in spacetime. From
this principle, the formalism of quantum mechanics emerges with a
radically new content, no longer dealing with things (atoms,
particles, or fields) to be measured. Instead, quantum mechanics is
recognized as the theory of distributions of uncaused clicks that form
patterns laid down by spacetime symmetry and is thereby revealed as a
subject of unexpected simplicity and beauty. The departure from usual
quantum mechanics is strikingly borne out by the absence of Planck’s
constant from the theory. The elimination of indeterminate particles
as cause for the clicks, which the principle of genuine fortuitousness
implies, is analogous to the elimination of the ether implied by the
principle of relativity.

[...]

It is a hallmark of the theory based on genuine fortuitousness that it
does not admit physical variables. It is, therefore, of a novel kind
that does not deal with things (objects in space), or measurements,
and may be referred to as the theory of no things.

[...]

The intuitive feeling of the necessity of particles as cause for the
clicks may be compared with the adherence to the ether. This medium
appeared necessary as a carrier of the electromagnetic waves, but
obscured the discovery of the principle of relativity.

Genuine fortuitousness with its two faces, lack of cause and
discontinuity, is found to be the principle that underlies quantum
mechanics. The acceptance of the completely uncaused clicks goes
against deeply held beliefs, but is consistent with all evidence and
provides a simple principle for the theory.

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