What the CNN tower considered a solid structure frame or shell?

The CNN Tower, also known as the CN Tower, is primarily considered a shell structure due to its design and construction. Its iconic tall, slender shape relies on the strength of its reinforced concrete and steel, allowing it to withstand various forces, including wind and seismic activity. The tower's cylindrical form effectively distributes loads, making it efficient as a shell structure while also providing a distinctive aesthetic. Thus, while it has solid elements, it exemplifies the characteristics of a shell structure.