> You know, when I think of a library branch, I think of all knowledge
> being divided into branches.
>
> At the twigs would be the most recently attained facts.
>
> At the small branches more basic facts,
>
> At large branches even more basic facts,
>
> Until you get to the trunk, which provides nourishment for all the rest.
>
> Supposedly, each fact fits somewhere in the tree.
>
> At the twigs are the assertions.
>
> They are proven by more basic assertions.
>
> Which are proven by still more basic assertions.
>
> Until you get to the trunk, which supports all the assertions.
>
> The trunk facts are self proving, and need no further premise.
>
> So, some facts need no proving, or the trunk could not exist.
>
> How could we ever encounter such a fact, in this world where
> there are no absolutes?