While composing for symphonic ensembles, Glass also composed music for piano, with the cycle of five movements titled "Metamorphosis" (adapted from music for a theatrical adaptation of Franz Kafka's "The Metamorphosis"), and for the Errol Morris film "The Thin Blue Line", 1988. In the same year Glass met the poet Allen Ginsberg by chance in a book store in the East Village of New York City, and they immediately "decided on the spot to do something together, reached for one of Allen's books and chose "Wichita Vortex Sutra"", a piece for reciter and piano which in turn developed into a music theatre piece for singers and ensemble, "Hydrogen Jukebox" (1990).