  Bell's theorem, and its experimental tests, has shown that the two premises
for Bell's inequality - locality and objective reality - cannot both hold in
nature, as Bell's inequality is broken. A simple test is proposed, which for
the first time may decide which alternative nature actually prefers on the
fundamental, quantum level. If each microscopic event is truly random (e.g. as
assumed in orthodox quantum mechanics) objective reality is not valid, whereas
if each event is described by an unknown but deterministic mechanism ("hidden
variables") locality is not valid. This may be analyzed and decided by the
well-known reconstruction method of Ruelle and Takens; in the former case no
structure should be discerned, in the latter a reconstructed structure should
be visible. This could in principle be tested by comparing individual "hits" in
a double slit experiment, but in practice a single fluorescent atom, and its
(seemingly random) temporal switching between active/inactive states would
possibly be better/more practical, easier to set up, observe and analyze.
However, only imagination limits the list of possible experimental setups.
