According to our accepted and utilitarian convention, this is Day 1.
I have to start somewhere.
So I open at random Francis Ponge’s Le parti pris des choses, a Christmas gift from my son, to page 92. It says:

Le Galet (The Stone)
Le galet n’est pas une chose facile à bien définir. (The stone is not an easy thing to define well.)

How fine! What else is there to say tonight?
Not a thing can be defined easy and well. That’s the best definition.