1971, and construction on the new building started soon afterwards and continued until 1974. The building incorporates many reminders of the famous ballpark—the home plate of Forbes Field remains near its exact spot, protected under plexiglass. The outfield wall is outlined in the sidewalk by bricks, and the portion of the famously deep left-center field wall still stands across the street, marked "457 Feet". Originally, the classrooms were numbered to reflect the seating section of the old stadium where each classroom was located. However, this system confused people, and was changed in 2004 to a standard four-digit numbering system. Art Virgil Cantini's colorful porcelain enamel on steel mural Enlightenment and Joy (1977) is on display on the ground floor. The piece is an example of Cantini's use of circles, representing the earth, moon, and sun, an artistic trend inspired by the Apollo moon landings. The work was created to honor former University Chancellor Edward Litchfield, who died in a plane crash in 1956. Cantini's 1965 steel rod and multicolored glass sculpture New Horizons, Skyscape is also on display near room 1500. The sculpture was donated to the university by the Joseph Horne Company from its department store in the South Hills Village mall where it had previously been on display. Tony Smith's 1971 painted steel sculpture Light Up!, commissioned by Westinghouse and originally displayed in downtown Pittsburgh, can be found outside Posvar Hall, between it and Hillman Library. Donated to and re-installed at Pitt in 1988, it was temporarily loaned to the Museum of Modern Art and displayed in front of the Seagram Building in New York City for a 1988 Tony Smith retrospective. Aerodrome One of two surviving Langley Aerodromes, Aerodrome No. 6 dating from 1896, is displayed in the ground floor lobby amid various artworks and sculptures. The Aerodrome was an experimental aircraft commissioned by the United States Army from former Pitt professor and Smithsonian Institution Secretary Samuel Langley. It flew in November 1896, further proving (after the success of No. 5 in May) the feasibility of engine-driven heavier-than-air flight. The aircraft was restored in part by Pitt engineering students. Fabric on the wings and tail is the only new material, however; the tail and several wing ribs were rebuilt using wood provided by the Smithsonian Institution and dating from the same time period. The restoration was completed over two years and the plane placed on display in