Louis Sullivan, a visionary American architect of the late 19th and early 20th centuries, is celebrated as a pioneer of modern skyscraper design and a leading figure in the development of the Chicago School of architecture. Known for his famous adage "form follows function," Sullivan's innovative designs and ornate decorative details left an indelible mark on the architectural landscape of his era.

Here are three of Louis Sullivan's most renowned architectural works:

1. Wainwright Building (St. Louis, Missouri)

   Often considered one of the first true skyscrapers, the Wainwright Building, completed in 1891, showcases Sullivan's signature use of intricate terra cotta ornamentation and vertical emphasis in its design.

2. Carson, Pirie, Scott and Company Building (Chicago, Illinois)

   This Chicago landmark, constructed in 1899, is celebrated for its striking ironwork and decorative elements. It exemplifies Sullivan's innovative approach to retail store architecture.

3. Guaranty Building (Buffalo, New York)

   Built in 1895, the Guaranty Building is a masterpiece of Sullivan's work, known for its stunning terra cotta detailing and pioneering use of steel framing, which allowed for its distinctive vertical design.

These buildings reflect Louis Sullivan's progressive architectural ideas and his significant impact on the development of modern skyscraper design