Outside the spokes is the Aurbis, though this is probably better understood in context as Aetherius, the spirit realm, the rim of the Wheel.

Earth Bones) of the Aedra, those who formed the earth upon which mortals tread and gave them the blending of the primordial forces of Anu and Padomay: static change.

The Spokes are 'eight components of chaos', believed to be referring to the Divines and the primordial force of Padomay. The Wheel is the structure of the Aurbis. The Towers' relation to the metaphysical Tower is unclear, but presumably, understanding both is necessary to understand either. The Towers of Nirn are magical and physical echoes of Ada-Mantia which are believed to strengthen and reinforce the strictures of Mundus. The Towers are not to be confused with The Tower, which is a constellation. The Towers are capable of causing extreme alterations in reality that can result in Dragon Breaks. They are immensely powerful, and are responsible for the stabilization of Mundus as well as a wide array of other fantastical functions.

The Towers are ancient structures on Nirn which date back to as early as the end of the Dawn Era. Anyway, everyone seems to agree it has power, but no one knows exactly what kind.' Others believe that before the Dragon broke, the tower helped protect us from invasion from Oblivion They help keep Mundus-the World-from dissolving back into Oblivion. 'Well, some think that the White-Gold Tower-and some other towers around Tamriel-help, well, hold the world up, or something like that.

A tower of dawn