  Weyl’s response to Einstein’s criticism that a Weyl geometry  conflicts with experience, took advantage of the fact that the  underlying dynamical laws of matter which govern clocks and rigid  rods, were not known at that time. Weyl could thus argue that it is  at least theoretically possible that there exists an  underlying dynamics of matter, such that a Weyl geometry, according  to which length transfer is non-integrable, nonetheless coheres with  observable experience, according to which length transfer  appears to be integrable. However, as was clearly pointed  out by Wolfgang Pauli, Weyl’s plausible defence comes at a   cost.[49]  Pauli (1921/1958, 196) argued that Weyl’s defence of his theory  deprives it of its inherent convincing power from a physical point of view. 