Some architects persisted in using Neo-Gothic tracery as applied ornamentation to an iron skeleton underneath, for example in Cass Gilbert's 1913 Woolworth Building skyscraper in New York and Raymond Hood's 1922 Tribune Tower in Chicago. But, over the first half of the century, Neo-Gothic was supplanted by Modernism, although some modernist architects saw the Gothic tradition of architectural form entirely in terms of the "honest expression" of the technology of the day, and saw themselves as heirs to that tradition, with their use of rectangular frames and exposed iron girders.