This original postcard is from the 1933 Century Of Progress (Chicago World's Fair) which was held in Chicago. It is in good condition and the front features the "Dairy Building". The reverse side features a postcard format, which is unused and a paragraph that says "An oval-shaped structure, 167 feet long and 114 feet wide, with a tower 69 feet high. It is painted a milk-white. The principal display is a cyclorama on which masses of color are played by the Clavilux, or color organ, designed to play with color as musical instruments play with sound. This spectacle presents the development of the dairy industry from the cavemen to the present scientific preparation and distribution of milk products. A unique feature is a mechanical reproduction of a cow showing the cow as a chemical laboratory, manufacturing milk" and measures approx. 3 1/2" x 5 1/2".