The Ace

In the center of the country that I write about, there is a spectacular building
world-renown for its immensity.

If we follow the literature, the first indication we have to it's aesthetic
comes from the logo of the company that produced it -
a company known as 'Axel Industries.'
Axel Industies

The following is a passage from God, Man, and The Machine describing the building:

The Ace or Axel Industries Central (AIC) Building - the impossible ziggurat of Silverberg.
The Ace could be seen from a generous distance, standing nearly a mile high and half as wide.
Like a great, silver, isosceles mountain it often disappeared into the clouds.
On a clear day one could see that as it culminated towards its apex, the gigantic building narrowed itself progressively,
betraying a considerable mesa far atop.

This is a passage from The Terrors of Wonder describing the building:

The Axel Industries Central (AIC) Building, or more colloquially known as ‘the Ace,’
could be seen from a generous distance, standing nearly a mile high and half as wide
(not including the flying butresses). The ziggurat of Silverberg...on the day of its completion in 2038,
Silverberg announced its independence.
This great, silver, isosceles mountain often disappears into the clouds.
On a clear day from a respectable distance, however, one could see that as it culminated towards its apex,
the gigantic building narrowed itself progressively, betraying a considerable mesa at its top.

I thought that I should make a picture of it, as that seemed easier that trying to accurately describe it.
I decided to paint it, so I put it on 3 pieces of canvas, each viewing from one side:

Below: Looking at it from the West (or East) and looking to the East (or West)

The Ace as seen from East to West

Below: Looking from the North (or South), and looking toward the South (or North)

The Ace as seen from North to South

Below: From above

The Ace as seen from above

As the entire structure is mirrored, I realized I had no earthly idea as to how to shade it properly.
I therefore built a model so that I could finish the picture:

The Ace as seen from East to West

In summary:

Juxtaposed