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We show how one can be led from considerations of quantum steering to Bell'stheorem. We begin with Einstein's demonstration that, assuming local realism,quantum states must be in a many-to-one ("incomplete") relationship with thereal physical states of the system. We then consider some simple constraintsthat local realism imposes on any such incomplete model of physical reality,and show they are not satisfiable. In particular, we present a very simpledemonstration for the absence of a local hidden variable incomplete descriptionof nature by steering to two ensembles, one of which contains a pair ofnon-orthogonal states. Historically this is not how Bell's theorem arose -there are slight and subtle differences in the arguments - but it could havebeen.

How Einstein and/or Schr\"odinger should have discovered Bell's Theorem in 1936