  We propose an experiment that allows one to test the Einstein's intuitive
objection to Bohr's quantum mechanics (QM), which was that if QM is correct,
then there should be a nonlocality related to the collapse of a single-particle
macroscopic wavefunction, which by no means is compatible with special
relativity. The idea of the experiment is related to the so-called integer
quantum Hall (IQH) systems known to have macroscopic quantum orbits often
called extended states. The experiment appeared realizable in a modified IQH
system and we have found that a single-particle nonlocality does exist
precisely as it follows from QM. This fact makes one come back to the
Bell-Popper idea to revive the Lorentz-Poincare "dynamic" version of relativity
together with the classical concept of space and time. But now, if to add the
single-particle nonlocality to the Bohm-Hiley model of undivided universe, one
can solve the most formidable problem - to find a preferred reference frame
without involving the vague notion "aether". Moreover, now one can adopt a
deeper-than-relativistic concept of what we call "reality", which opens the
door to a realistic interpretation of QM and, after all, to the awareness of
the worldview of this extremely successful theory.
