Prism, set to an early Beethoven piano concerto, is a rich and vibrant three-part, neo-classical ballet for 28 dancers. The swiftly paced first movement for three sets of three dancers and an ensemble is filled with sprightly contrapuntal steps. A langorous second movement featuring a poetic pas de deux that is echoed by the section's background couples is followed by an exuberant final movement that is a showcase of male dancing. Prism was Mr. Tomasson's second work for New York City Ballet. In 1983 he created Ballet d'Isoline on the Company.