"The Rectangle" began as a "Chicago Tribune" page featuring a variety of cartoons and serial features. King's "Rectangle" Sunday page, usually printed in black-and-white outside the comics section, was a late addition to a page that ran for years in the "Tribune". On January 9, 1913, King introduced a bounded rectangle containing themed single-panel gags (beginning with a page headed "Hints to Husbandettes"), but pages in that format did not appear with any regularity until February 1914. "The Rectangle" title was finally introduced on December 27, 1914.