What architectural style characterizes the Aon Center in Chicago?

The architectural style that characterizes the Aon Center in Chicago is Modernism. This style is defined by its emphasis on function over form, a minimalistic approach, and the use of contemporary materials, such as glass and steel. The Aon Center, completed in 1973, reflects these principles through its sleek, minimalist design, which prioritizes clean lines and a streamlined silhouette.

Its facade, primarily made of reflective glass, exemplifies the Modernist pursuit of simplicity and openness, allowing for natural light to play an integral role in the atmosphere of the interior spaces. Additionally, the Aon Center’s height and scale are consistent with the modern skyscraper tradition, which seeks to maximize space while maintaining a harmonious relationship with the surrounding urban landscape.

Other architectural styles do not suit the Aon Center's design ethos. Post-Modernism, while also prominent in Chicago, often incorporates historical references and decorative elements, which are not a feature of the Aon Center's exterior. Neoclassicism is characterized by its grand classical details and symmetry, while Art Nouveau is known for its organic forms and intricate detailing. These styles contrast significantly with the Aon Center's clean, straightforward approach that embodies Modernist principles.