Chicago Stock Exchange, view from northeast.  (Contemporary post card, collection of the author)

The Stock Exchange, a project to fund a new trading room through the provision of office space for traders and associated businesses, alternated bay windows with flat, tripartite windows, in a hybrid elevation that emphasized verticality– a theme that Sullivan would soon propose as the skyscraper’s most basic expression.

Taken from Chicago Skyscrapers, 1871-1934 (University of Illinois Press, June 2013).

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