Which element is often highlighted in the facades of Chicago skyscrapers?

The prevalent use of glass curtain walls in the facades of Chicago skyscrapers dramatically symbolizes the city's architectural advancements, particularly during the late 20th and early 21st centuries. This design feature is characterized by large expanses of glass that not only enhance the aesthetic appeal but also allow for natural light to permeate the interiors. The glass curtain wall system also facilitates greater energy efficiency and offers flexibility in design, enabling architects to create sleek, modern silhouettes that can reflect the surrounding environment.

This emphasis on glass is a hallmark of Chicago's skyline, showcasing the innovative use of materials in modern architecture that emerged from the city's historical legacy of skyscraper development. Moreover, glass curtain walls contribute significantly to the iconic appearance of many of Chicago's famous buildings, such as the Willis Tower and the John Hancock Center. Their reflective surfaces create a dynamic interplay with light and the weather, offering a continually changing view of the city's architecture, which is particularly appealing to residents and visitors alike.