I've always wondered about that.
Theoretically, 1/3 of a meter should exist.
It is not marked on a meter stick. Clearly that means it does not exist, since it is not clearly marked on a meter stick.
So, if 1/3 of a meter does not exist, then a meter actually only equals 2/3 of a meter.
But 2/3 is not marked, and you cannot have 2/3 without that first 1/3 anyway, so clearly 2/3 does not exist either.
So, 2/3 of a meter does not exist.
That leaves you with a meter being equal to 1/3 of a meter.
We have already proven that 1/3 of a meter does not exist.
Thus, we have the proof, a meter does not exist.
What is this metric crap of which you speak?