I've been trying to make sense of the Tapestry's structure in Mage the Ascension as described in the 20th anniversary edition, but there some points I'm not sure I understood correctly.
So, if I get it right, the three Umbrae (High, Middle and Low Umbra) and the Near Umbra are some sort of "different dimensions", like parallel planes of some kind. On the other hand, the Deep Umbra and the Horizons are in "our plane plane of existence", as the book describes the First Horizon being located at the end of Earth's atmosphere and Far Horizon at the asteroid's belt after Pluto. Everything beyond that is the Deep Umbra, and Zones like the Digital Web are limited areas with certain characteristics spread throughout our plane and the Umbrae. There is a nice pic I found online displaying the whole thing:
On the other hand,the book also states that Horizon is the region that separates the three Umbrae from one another, and that's where it starts getting confusing for me. So either my interpretation of the three Umbrae Realms as parallel planes is wrong or Horizon isn't exactly a physical region in our solar system. Is Horizon both in "this dimension" and in the other Umbrae, in way it intersects all of them? How do you interpret all this?
I guess this is all probably meant to be confusing, as many other things in the World of Darkness, but I would like to know what is your take in all this.