What design element is associated with the St Regis Chicago building?

The St Regis Chicago building is notable for its use of frustums in its design. Frustums are geometric shapes that resemble truncated pyramids and are integral to the overall aesthetic of the skyscraper. This unique design approach not only enhances its visual impact but also contributes to the building's structural efficiency. The use of frustums helps create a dynamic silhouette that distinguishes the St Regis Chicago from other skyscrapers, enabling it to stand out in the city's iconic skyline. This particular design element signifies a blend of innovative architecture and geometric precision, making it a key feature of the building's identity.