Shortly after Atlantis sank thousands of years ago, the court official in charge of preventing girls from learning to read, an evil man named Caliban, formed the Caliban Society in order to keep alive his dream of a world in which only boys were taught to read.  The Caliban Society has been working toward that goal ever since.  It has many secret, evil plots to keep girls from reading.  One way it does this is to sneak into libraries and take out books that girls might enjoy.  They burn great piles of these books in their secret, evil ceremonies.  A good way to foil their plans is for Girls Guilders to check out library books so that Caliban Society members can’t get them.

The symbol of the Caliban Society is a skull sitting on top of a closed book.  The symbol represents the oath that all Calibaners should be willing to give their lives in order to keep girls from reading.