  In this paper I review three different positions on the wave function,
namely: nomological realism, dispositionalism, and configuration space realism
by regarding as essential their capacity to account for the world of our
experience. I conclude that the first two positions are committed to regard the
wave function as an abstract entity. The third position will be shown to be a
merely speculative attempt to derive a primitive ontology from a reified
mathematical space. Without entering any discussion about nominalism, I
conclude that an elimination of abstract entities from one's ontology commits
one to instrumentalism about the wave function, a position that therefore is
not as unmotivated as it has seemed to be to many philosophers.
