Which characteristic defines the frustums used in building design?

Frustums are geometric shapes that are formed by truncating a pyramid or cone, resulting in a shape that has two parallel bases of different sizes. In building design, the use of frustums often relates to the concept of stacking, where multiple frustums can be placed on top of one another to create visually interesting forms, as well as to allow for increased structural stability and efficiency. The design allows for a transition between different sections of a structure, helping to provide a gradual change in mass and volume.

This characteristic is particularly relevant in contemporary designs and skyscrapers, where multiple frustum shapes can create dynamic and engaging profiles that follow the skyline, blending functionality with aesthetic appeal. The versatility of frustums makes them an essential element in modern architectural practices.

In contrast, solid cubes, curved structures, and angled columns represent different geometric principles that do not encompass the unique stacked structure of frustums. Solid cubes imply a uniform shape without the tapering characteristics of frustums, while curved structures offer a different approach found in organic architecture. Angled columns may serve specific structural purposes but do not relate to the geometric definition of frustums.