Full Idea
There is one thing of which one can say neither that it is one metre long, nor that it is not one metre long, and that is the standard metre in Paris.
Gist of Idea
The standard metre in Paris is neither one metre long nor not one metre long
Source
Ludwig Wittgenstein (Philosophical Investigations [1952], §050)
Book Reference
Wittgenstein,Ludwig: 'Philosophical Investigations', ed/tr. Anscombe,E. [Blackwell 1972], p.25
A Reaction
The remark which inspired Kripke's causal theory. Clearly W. is wrong, because it is one metre long, but why is it that length?