 Alternatively, one might try to meet the objection by adopting what Wilson 2006 calls the ‘no fundamental mentality’ constraint. On this interpretation, what proponents of the Via Negativa have in mind is that F is a physical property only if F is not fundamentally mental, where in turn to be ‘not fundamentally mental’ is most naturally understood as entailing that if F is a fundamental property then it is non-mental. This version of the view avoids the problem about having c-fibers since presumably that property is not fundamental. But once again problems remain. Take the world we considered above at which the fundamental properties are both mental and physical; in effect, what applies to c-fibers firing (if the identity theory is true) applies to the fundamental properties instantiated at this world. As I said, this scenario is far-fetched, but it doesn’t seem to be impossible, and it is certainly not impossible simply as a matter of the definition of the words. And yet it would be impossible for that reason if the ‘no fundamental mentality’ version of the Via Negativa were true.