/* Dear Nikola, Thank you for your letter.*/
Finally I recognize the futility of my belated efforts 
to learn to "understand" quantum mechanics, even in some small
measure.  I need to put my thoughts in writing to obtain
a perspective on them, but there is no corresponding need for you
to read, not to mention to reply, to what I write.

With respect to my own, subjective "experience" (Erleben) of quantum
mechanics, I deduce from
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4960318/
the hypothesis that my eye might be capable of detecting
the stimulus ofa even a single photon. However, if my interpretation
of quantum mechanics is correct, such detection is impaired by
the circumstance that the localization of a photon precludes
its having momentum, and the identification of any photo's momentum
precludes its localization on any specific photoreceptor cell
of the retina. Accordingly with repect to determining whether
I was sighted or whether I was blind, I would find myself in
the same predicament as Schroedinger's cat with its inability
to determine whether it was dead or alive. I understand that in
old age, when the vitreous jelly inside the eye has liquified
and collapsed, residual fibers tugging at the peripheral retina
will produce in total darkness, sensations of light which are
indistinguishable from excitation of retinal cells by photons.
I conclude that subjective phenomena of vision cannot illuminate
a path on which I can escape from the labyrinth of quantum mechanics.

The history of thought suggests the possibility of a different route
of escape.  Quantum mechanics is the endstage of the assumption that
reality might be ascertained by subdivision into progressively smaller
particles to the stage at which the world is divided into entities
which are themselves indivisible. 
That is how I understand atomic theory.
Quantum mechanics is the dead end of atomic theory, asserting as it
does that atoms, i.e. indivisible particles, if located,
have no momentum, or atoms, i.e. indivisible particles if they have
momentum, cannot be located. In other words, why not just admit that
the search for indivisible particles is a failure, because they can
not exist.