The Devon Tower is the tallest building in OKC and has a complete glass facade. As you drive by the building stands out almost like a massive crystal because of the way `light reflects off the glass. I have always admired this building but, I gained a larger interest in this building when I had the opportunity to study the construction process of high rise buildings. The things about these types of building that interest me more than anything is the foundations. When I discovered that these buildings have mat slabs that can be up to 7 feet deep in addition to the piers underneath. It was hard for me to wrap my mind around a building using 6,500 cubic yards in a time span of 18 hours.