The Tower is rife with minor mages, apprentices, and stripling conjurers. These come from all quarters seeking to live and study their craft within Urth’s foremost center for the magical arts.  Of these, only a few become Tower Wizards, a hierarchy that admits new members only when an existing member is lost, either to age, expulsion, or misfortune.  Wizards of the Tower are highly distinctive, both in terms of their appearance and in their practice of magic. However, each belongs to a circle corresponding to the level of the Tower where they live and share a central workshop. The ambitious among them strive, by various means and achievements, to ascend from one circle to the next higher.  However, none will say if any has ever reached the top.  The ground level of the Tower houses the most recently admitted Wizards, those of the 1st Circle.  But the number of circles above the 1st, and therefore the number of levels in the Tower, is either unknown, or a well-guarded secret.