The idea of form follows function proposes that a building’s purpose should be the starting point for its design, rather than its aesthetics. As previously mentioned, this axiom is commonly attributed to Louis Sullivan. The phrase was associated with modernist architects in the early-20th century, as skyscrapers (the ultimate example of form following function) became more prominent following their introduction in the 1890s. The birth of the office reflected the changing workforce and introduced a new age of architecture, as disruptors such as Sullivan began to challenge the idea of buildings based solely upon innovations from ancient Greek and Roman architecture.