The Tellurian is the whole of reality, including the mundane world, the Near Umbra, the Dreaming, the Deep Umbra, etc.[1]
A tellurian is a mechanical model for demonstrating the rotation and orbit of the Earth. Mages use this as a metaphor for all Reality -- what is, what was, what will be (or might be), even what could be. This raw potential takes shape in the Tapestry, but a mage can re-weave parts of this by drawing on the infinite possibilities of the Tellurian.
References[]
- WTA: Umbra: The Velvet Shadow, p. 12
- MTAs: Mage: The Ascension 20th Anniversary Edition, p. 28
- MTAs: Mage: The Ascension Revised Edition, p. 36