September 3^rd is celebrated as a global commemorative day for skyscrapers, dubbed as the 'Skyscraper Day.' The date was chosen because it's the birthday of Louis H. Sullivan, who's known as the 'father of skyscrapers.'

Louis Henry Sullivan (September 3, 1856 - April 14, 1924) was an American architect, and has been called the "father of skyscrapers" and 'father of modernism'. He was an influential architect and is considered by many as the creator of the modern skyscraper.

His true innovation came in the way he adapted previous ornamental styles to the newly-emerging tall buildings of the late 19th century, using it to emphasize a building's verticality. It is this principle that led to his famous tenet of 'form follows function'

Among the buildings for which Sullivan is known are the Wainwright Building in St Louis, Missouri, the Guaranty Building in Buffalo, New York and the Carson Pirie Scott Building in Chicago.