We have such logs in our eyes, our bent in onto ourselves (incurvatus sumus, or some such Latin phrase) is so forceful we can hardly unbend it when we perceive it.
There's no such thing as the given, or the innocent eye fer that matter, but some marks in stone, given the cross referencing data hold up to questionning, X «was» there, x «made» the mark, x «wrote» the documentation in his log book..