"(...) Music, states of happiness, mythology, faces worked by time, certain twilights and certain places, want to tell us something, or something they said that we should not have lost, or they are about to say something; this imminence of a disclosure, which does not take place, is, perhaps, the aesthetic fact ".
Jorge Luis Borges [The rampart and the books]
In one of the deepest dreams that I remember, the librarian Vilsio Zubur supposedly could find, among the shadows of some hidden and tired corridor, the so-called crimson hexagon. The fatigue, but also the frenzy, did not prevent him from giving an account of it, leaving testimony of those books of smaller format (the omnipotent, illustrated and magical ones), of which now it is up to us to decipher the mystery.
From the comments, it is not possible to say whether they were rudimentary or secretive (hermetic). If they were first studies, or if their closure makes them impenetrable.
From their scarce statements we can barely manage to glimpse some Books of mysterious unfolded signs, some Maps of labyrinthine paths, of unfathomable  writings.
All constructions of light destined to describe shadows, reflections of paths, testimonies of the path, as to come about, perhaps of labyrinths.