In 1964 he repainted the ceiling of the Paris Opera using of canvas. He painted two monumental murals which hang on opposite sides of the new Metropolitan Opera house at Lincoln Center in New York which opened in 1966. The pieces, "The Sources of Music" and "The Triumph of Music", which hang from the top-most balcony level and extend down to the Grand Tier lobby level, were completed in France and shipped to New York, and are covered by a system of panels during the hours in which the opera house receives direct sunlight to prevent fading. He also designed the sets and costumes for a new production of "Die Zauberflöte" for the company which opened in February 1967 and was used through the 1981/1982 season.