giving the facade a slightly different tint during different times of day. The terracotta panels were built to the minimum thickness required by city building codes. At the time of 330 West 42nd Street's construction, terracotta was not commonly used in International Style structures, which frequently contained glass, steel, and concrete instead. In designing the building, Hood had considered several different colors for the terracotta panels, including "Chinese red", orange, yellow, and gray. Ultimately, blue-green was selected for its "atmospheric quality", which was suitable regardless of the color of the sky on any given day. Hood referred to the color as blue, while McGraw-Hill referred to the color as green. McGraw-Hill executive James H. McGraw Jr., who had selected the color himself, was elsewhere for much of the building's construction in 1931, but was supposedly "appalled" at the color of the building when he returned. The building was nicknamed the "Green Building", the "Green Kremlin", the "green giant", and the "green monster" due to its color. Eric Nash likened the color to the Ishtar Gate of Babylon. The blue-green color contrasted with the red and white of the Daily News Building and the black and gold of the American Radiator Building, both of which Hood had also designed. There are more than four thousand windows, each of which contains a frame painted apple green. The windows are grouped into sets of three or four, separated horizontally by dark metal spandrel panels, and were built to the maximum height allowed under city construction codes of the time. Due to restrictions on the amount of glass a facade was allowed to have, the windows were divided horizontally by metal bars. The vertical mullions between windows, as well as the tops of each window sash, were painted in vermillion. These painted bands were intended to give the impression that each group of windows was a single window opening. The windows and terracotta panels were juxtaposed to emphasize the horizontal dimensions, a characteristic of the International Style. This was a great contrast to Art Deco facades, which were more vertically oriented. The only deviation from the facade's horizontal emphasis is on the eastern facade, which contains a pair of blue-green vertical strips at its center. After the structure's completion in 1931, Hood and McGraw-Hill had compared the facade to an automobile, a common Art Deco symbol. In particular, Hood thought the facade had a