I stumbled over a large fire in one of the rooms - as if somebody was trying to burn down the library. I tried to put it out by pressing several keys and even by standing in the flames. Of no avail.
The flames are visible from other rooms, too.
Judging by the charred appearance of the librarians, I also speculated whether this was the birth, the death or even the initiation of these.
Could it be, that this is the infamous and fiery "easter egg"? Making the Library of Babel share the fate of the Library of Alexandria?